“Difficulties in Teaching and Learning Intensive Vietnamese through Preschool Materials for Ethnic Minority Children: A Saussurean Semiotic Perspective”. VNU Journal of Social Sciences and Humanities 2, no. 1 (June 1, 2026): 112–127. Accessed July 3, 2026. https://ojsnv.metatekvn.com/index.php/JOSSH/article/view/1587.