Nguyen, N.H. and Bui, N.B.T. 2026. Teachers’ Perceptions of Using Digital Learning Materials in Teaching Speaking and Listening Skills Based on Speech Etiquette to Grade 2 Students. Dong Thap University Journal Science - Asian Journal of Educational Sciences. 1, 2 (Aug. 2026), 119–133. DOI:https://doi.org/10.52714/dthu.ajes.32.2042.