1. Faculty of Economics, Thu Dau Mot University, Thu Dau Mot 820900, Vietnam
2. Faculty of Civil Engineering, University of Transport and Communications, No.3 Cau Giay Street, Lang Thuong Ward, Dong Da District, Hanoi 100000, Vietnam
3. Vietnamese–German Transport Research Centre, Vietnamese–German University, Ring Road 4, Quarter 4, Thoi Hoa Ward, Ben Cat 284769, Vietnam