1. Faculty of Fundamental Sciences, Hanoi University of Industry, 298 Cau Dien Street, Hanoi, Vietnam
2. School of Education, Can Tho University, 3-2 Road, Can Tho City 900000, Vietnam
3. Faculty of Physics, Hanoi Pedagogical University 2, Nguyen Van Linh Street, Xuan Hoa, Vinh Phuc, Vietnam
4. Hoa Binh University, My Dinh 2, Nam Tu Liem, Hanoi, Vietnam
5. Department of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan