ENHANCING VOCABULARY RETENTION THROUGH GAMIFIED LEARNING: EVIDENCE FROM VIETNAMESE EFL SECONDARY CLASSROOMS. The International Journal of Language Studies (ISSN : 3078 - 2244), [S. l.], v. 2, n. 2, p. 111–128, 2025. DOI: 10.60087/ijls.v2.n2.011. Disponível em: https://ijlangstudies.org/index.php/home/article/view/v2.n2.011. Acesso em: 19 oct. 2025.