Tham, Pham Thi Hong, Pham Thi Phuong Thuc, Phan Thi Huong Giang, and Nguyen Thanh Tam. “The Current Status of Secondary School Teacher’s Perception of Happiness in Nam Dinh Province During the Implementation Period of the 2018 General Education Program”. Asian Journal of Social Sciences and Management Studies 9, no. 3 (July 26, 2022): 60–64. Accessed November 28, 2022. https://www.asianonlinejournals.com/index.php/AJSSMS/article/view/4069.