Ho, H.P.M. and Nguyen, V.B. 2019. Expanding 4-graders’ vocabularyin teaching spelling, reading subject at Ca Mau city primary schools via cross-subject integration. Dong Thap University Journal of Science. 39 (Aug. 2019), 3–7. DOI:https://doi.org/10.52714/dthu.39.8.2019.709.