ชัยชนะ ร. Guidelines for the Development of Teaching Profession Competency of Secondary School Teachers under The Office of Savannakhet Provincial Education and Sports Service , Lao People’s Democratic Republic. JILS [internet]. 2018 May 24 [cited 2026 Sep. 12];11(4):130-41. available from: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/125448