... reason find it difficult to retain their interest in school life and to continue to participate in school-based activities. The National School Health Program in Vietnam was developed by the ... and educational psychology experts in order to develop and implement MH intervention programs in schools. Key words: Mental health problems, influential factors, secondary schools 1. Introduction ... factors related to personal, family and school, ie, sex, puberty phenomenon, parents do not live together, low study performances, school connectedness school's regulation of bullying, bullying...