Anh Phan
(1), Ha Thu Nguyen
(2), Hao Nguyen
(3), Yoshiki Matsui
(4)
(1)
Vietnam National University – University of Economics and Business, Viet Nam,
(2)
Vietnam National University – University of Economics and Business, Viet Nam,
(3)
Yokohama National University, Japan,
(4)
The Open University of Japan, Japan
