Ut Phuong D, Lan Phuong D, Lan Anh D. CURRENT STATE OF KNOWLEDGE AND SKILLS OF PRESCHOOL TEACHERS IN TEACHING PROBLEM-SOLVING SKILLS TO 5-6-YEAR-OLD KINDERGARTEN CHILDREN IN STEAM EDUCATIONAL ACTIVITIES. HNUE Journal of Science: Educational Science [Internet]. 2024 Oct. 2 [cited 2025 Jan. 15];69(4A):198-207. Available from: https://hnuejs.edu.vn/es/article/view/536