AUTHOR=Thanh Thuy Bui , Nguyen Xuan-An , Thi Viet Ha Nguyen , Thanh Ha Vo , Thi Kieu Anh Nguyen , Thi Ngoc Hien Do TITLE=Brief research report: development of codes of conduct in online classrooms for Vietnamese high school students JOURNAL=Frontiers in Education VOLUME=Volume 10 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/education/articles/10.3389/feduc.2025.1533884 DOI=10.3389/feduc.2025.1533884 ISSN=2504-284X