Tran, Ngoc Thi Minh. “Declining Returns to Investment in Tertiary Education in Vietnam”. Science & Technology Development Journal: Economics- Law & Management 4, no. 3 (August 16, 2020): 851-858. Accessed December 4, 2024. https://stdjelm.scienceandtechnology.com.vn./index.php/stdjelm/article/view/590.