Vu Thi Minh Hien, Pham Van Dung and Tran Kim Loan 2023. Assessment of Customers’ Satisfaction with Helicopter Tour Services for Sightseeing at Ha Long Bay. VNU JOURNAL OF ECONOMICS AND BUSINESS. 3, 1 (Feb. 2023). DOI:https://doi.org/10.57110/jebvn.v3i1.163.