Wetchakama, M. and Tanunchaibutra, P. (2023) “The development of Vietnamese language supplementary courses in daily life for improvement of speaking ability using the 3ps approach to language teaching for grade 9 students ”, Journal for Developing the Social and Community . Bangkok, Thailand, 10(1), pp. 727–742. available at: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/261753 (accessed: 2 September 2026).