1. Department of Sociology, Environmental and Business Economics; University of Southern Denmark, Niels Bohrs Vej 9, 6700, Esbjerg, Denmark and Faculty of Economics, Nha Trang University; No. 04 Nguyen Dinh Chieu, Nha Trang Khanh Hoa Vietnam
2. Department of Sociology, Environmental and Business Economics; University of Southern Denmark; Niels Bohrs Vej 9 6700 Esbjerg Denmark