Determine factors influencing the loyalty of customers using 4 and 5-star hotel service in Ho Chi Minh City in a multidimensional approach in the service quality model; assessing the impact of customer loyalty factors on the use of 4 and 5-star hotels in Ho Chi Minh City based on a multidimensional approach in service quality model; propose some policy recommendations to increase the loyalty of customers using 4 and 5-star hotels in Ho Chi Minh City. | Summary of Doctoral thesis: Factors influencing loyalty of customers for 4 and 5 star hotels in Ho Chi Minh city