Nguyen, T Phong1, Hue, L T2, Si, D T2, Thuc, T T3
1Department of Physics, Can Tho University, 3/2 Street, Can Tho, Vietnam
2Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
3Department of Education and Training of Ca Mau, 70 Phan Dinh Phung, Vietnam