NGUYEN, Thi Mien. EVALUATING THE LEVEL OF FOREIGN LANGUAGE LEARNING INVESTMENT FOR PROFESSIONAL DEVELOPMENT BASED ON DARVIN AND NORTON’S INVESTMENT MODEL IN A VIETNAMESE UNIVERSITY. VNU Journal of Foreign Studies, [S. l.], v. 42, n. 2S (Special Issue), p. 66–81, 2026. DOI: 10.63023/2525-2445/jfs.ulis.5692. Disponível em: https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/5692. Acesso em: 1 aug. 2026.