1. Department of Mathematics Thai Nguyen University of Education Thai Nguyen Vietnam
2. Department of Basic Vietnam Academy for Ethnic Minorities Hanoi Vietnam
3. Faculty of Pedagogy, VNU University of Education Vietnam National University Hanoi Vietnam
4. Institute of Theoretical and Applied Research, Institute of Theoretical and Applied Research Duy Tan University Hanoi Vietnam
5. Editing Department Vietnam Journal of Education Hanoi Vietnam
6. Center for Research and Practice on Education Phu Xuan University Thuathien‐Hue Vietnam
7. Research and Development Department Center for Education Research and Development EdLab Aisa Hanoi Vietnam