The Issues Raised by the Thesis Continue to Solve

Tourism has become a key economic sector, making an important contribution to the industrialization and modernization of the Central Highlands. This is a very meaningful study in building and orienting strategies, but has not yet delved into the role of marketing in developing and enhancing the competitiveness of tourism.

(2) Dinh Kiem (2012) [16], “Developing ecotourism in the provinces of the southernmost Central Coast to 2020” (PhD thesis). The thesis has studied and clarified the theoretical basis related to ecotourism, especially sustainable ecotourism for a sea - island area and ecotourism in other environmentally sensitive areas. On that basis, the topic proposes main solutions including: Group of solutions to protect ecological environment and human resources; Group of comprehensive solutions to develop regional ecotourism. Proposing to organize a systematic and scientific spatial planning zoning for two provinces of the southernmost Central Coast. The thesis has used quantitative analysis for tourist forecasting.

Through the results of the thesis, the thesis has analyzed quite detailedly about ecotourism, however, it has not applied marketing theory in building tourism development strategies to attract tourists. In addition, the thesis mainly considers ecotourism as only a part of the tourism sector.

5) Studies on sustainable tourism development:

(1) Pham Trung Luong and colleagues (2002) [23], " Scientific basis and solutions for sustainable tourism development in Vietnam" (State-level topic). Based on the analysis of the current state of Vietnam's tourism, the study has proposed solutions for sustainable tourism development based on three factors: environment, economy and society, which have contributed to the restoration and effective exploitation of resources, protection of the tourism environment, community development, preservation and promotion of traditional cultural values. At the same time, the results of the study also show that to ensure tourism development: From an economic perspective, it is necessary to develop tourism products, develop tourism markets, policies for exploiting tourism resources and the environment, policies for investing in tourism development, policies for training and developing human resources, tourism promotion and advertising, application of science and technology, policies for the community; From an environmental perspective, it is necessary to have mechanisms, policies and organizations for managing tourism resources; From a social perspective it is necessary to ensure

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Protecting community rights, equality in business activities and enhancing the role of the community in the process of planning tourism development.

(2) La Nu Anh Van (2012) [50], " Developing tourism in Binh Thuan province from the perspective of sustainable development" (Doctoral thesis). The thesis has built a theoretical basis for tourism development from the perspective of sustainable development based on related theoretical and practical issues. Proposing a system of criteria to assess the sustainability of tourism activities. These are the contributions of the thesis in terms of theory of tourism development from the perspective of sustainable development in Vietnam. Based on the results, the thesis has pointed out the achievements and shortcomings, and proposed the main orientations and solutions for tourism development in Binh Thuan from the perspective of sustainable development. However, the thesis has only stopped at analyzing each factor without considering the level of impact of the factors. In addition, the thesis has not clearly pointed out the issues directly related to the development strategy of tourism in the overall economic, environmental and social aspects.

6) Studies related to tourism competitiveness:

(1) Nguyen Anh Tuan (2010) [49], “Competitiveness of Vietnam's tourism destinations” (Doctoral Thesis in Economics). The thesis applied models of destination competitiveness to the conditions of Vietnam, the Dwyer & Kim model (2003), analyzed and evaluated the current status of destination competitiveness of Vietnam's tourism industry; pointed out the strengths, weaknesses, opportunities and pressures on Vietnam's tourism industry as well as the causes of limitations in destination competitiveness of Vietnam's tourism industry. Proposed 4 viewpoints to improve the destination competitiveness of Vietnam's tourism industry: (1) Tourism must become one of the leading economic sectors, making an important contribution to national prosperity; (2) The policy environment must facilitate tourism development; (3) Tourism must be developed in a dynamic direction, adapting quickly and responding promptly to changes; (4) The tourism industry must be developed in the direction of quality, efficiency and sustainability. Based on these viewpoints and the results of theoretical and practical research, the author of the thesis has proposed 7 groups of recommendations on policies and solutions to improve the destination competitiveness of the Vietnamese tourism industry.

Through the analysis results, the thesis has successfully applied the model to evaluate competitiveness in Vietnam, however, the thesis has not adjusted the model, and has not pointed out the importance of the factors. Therefore, when applied to a specific destination, it will be difficult to obtain information such as a survey, because the questions are very broad and difficult to understand.

(2) Dao Duy Huan (2015) [15], "Assessing the competitiveness of Can Tho City's tourism industry", the study applied Porter's theoretical model of "5 competitive pressures" to assess the competitiveness of Can Tho City's tourism by analyzing and evaluating 10 factors: Infrastructure, Geographical location, Natural resources, Historical relics, Traditional festivals, Tourism products, Expansion investment, Image promotion, Accommodation facilities, Human resources, management. In the study, the competitive image matrix was used to compare the competitiveness of Can Tho City's tourism in comparison with the competitiveness of tourism in An Giang, Tien Giang and Ben Tre provinces.

Through the research results, the advantages and limitations of Can Tho tourism have been clarified. However, the research has not considered the role of the city government, the acceptance level of local residents, the social environment, etc.

7) Research related to local marketing to tourism development

(1) Nguyen Thi Thong Nhat (2010) [28] , "Local marketing strategy to attract tourists to Da Nang city", the study has overviewed local marketing theories applied to tourism development in Da Nang city. The study is based on local marketing strategies: local image marketing, local characteristics marketing, infrastructure marketing, human marketing. By investigating the current status of tourism development in Da Nang city, collecting secondary data, comparative analysis and SWOT. The study has pointed out 06 groups of tourism marketing factors in Da Nang city to attract tourists: improving the quality of tourism human resources, diversifying tourism products, reviewing planning, strengthening tourism promotion, raising people's awareness, and implementing tourism development linkage work.

Through the research results, the study applies Kotler's local marketing theory to the study of Da Nang City by considering 04 main strategies and drawing conclusions. However, the study has not clarified the implementation of marketing mix as

how and has not shown the order of importance of the factors as well as investigated the evaluation of tourists, staff and residents about tourism in Da Nang city.

(2) Tran Thi Kim Oanh (2016) [29], "Tourism development associated with local marketing strategies in Tuyen Quang province", the study has overviewed local marketing theories applied to local tourism development, specifically Tuyen Quang province. The study is based on local marketing strategies: local image marketing, local characteristics marketing, infrastructure marketing, and human marketing. The study uses secondary data on tourism development in Tuyen Quang province, and conducts a questionnaire survey of 3 groups of subjects: tourists, businesses and managers. Using the descriptive statistical analysis method using the average of perceptions of Tuyen Quang tourism. As a result, the study has affirmed 4 tourism development strategies in Tuyen Quang province: local image marketing, local characteristics marketing, infrastructure marketing and human marketing.

The research results show that the study has applied Kotler's original local marketing theory without adjustment to the marketing construction of Tuyen Quang and did not use the marketing mix implementation tool for the tourism attributes. This is a repetitive theoretical study, so it has not clarified the aspects of local tourism such as products, supporting factors, etc.

8) Research related to Ben Tre tourism:

(1) Ministry of Culture, Sports and Tourism (2015) [3], “Developing unique tourism products in the Mekong Delta” (project). The project surveyed the current status of tourism resources, tourism products and tourism activities in the Mekong Delta. With the aim of reviewing the current status and proposing the development of unique products in the Mekong Delta, the project considered aspects of natural resources, human resources and self-created resources. Through the analysis results, the project concluded that what makes Mekong Delta tourism different from other regions is the “Mekong River World”, the values that need to be exploited to develop unique tourism products include: 1) The value of river landscape associated with traditional life and livelihoods of the community in the lower Mekong River; 2) The value of the wetland ecosystem in the lower Mekong River and 3) Traditional cultural and spiritual values. From the unique advantages of the Mekong Delta region, the project has proposed specific product types including 02 types: (1) Products

Regional specific products (National level): river tourism, eco-tourism and cultural heritage exploration and (2) Regional specific products (Regional level): beach resorts, sightseeing and experiences of Vam Co, VCGT.

Through the results of the research, a very detailed and comprehensive survey was conducted on the resources and advantages for developing specific products of the Mekong Delta region, which is a reference document for research on tourism in the Mekong Delta, especially tourism products.

(2) Do Thu Nga and Pham Thi Thanh Hoa (2016) [26], “Tourism development

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