“…Hoi An city, which belongs to Quang Nam province, is a tourist city in the central part of Vietnam with a host of beautiful and unique landscapes and an ancient town designated as a UNESCO World Heritage Site (Pham Phu et al, 2019). The city, with 6,354.9 hectare area, has 13 administrative units, including nine wards (Minh An, Son Phong, Cam Nam, Cam Pho, Thanh Ha, Tan An, Cam Chau, Cam An and Cua Dai), three mainland communes (Cam Ha, Cam Thanh and Cam Kim) and one island commune (Tan Hiep) (Figure 2).…”