1. Faculty of Teacher Education, Danang University of Foreign Language Studies, Da Nang City, Viet Nam
2. Dong Nai University of Technology, Bien Hoa City, Viet Nam
3. Department of English, National Taiwan Normal University, Taipei, Taiwan
4. Department of Foreign Languages, Ha Tinh University, Ha Tinh City, Viet Nam
5. Faculty of Education, Thu Dau Mot University, Binh Duong province, Vietnam