Phuoc Minh Hiep et al. 2025. STRATEGY FOR SUSTAINABLE TOURISM DEVELOPMENT IN LY SON DISTRICT, QUANG NGAI PROVINCE TO THE YEAR 2030. HUIT Journal of Science. 25, S3_ICA (Jul. 2025), 146–163. DOI:https://doi.org/10.62985/j.huit_ojs.vol25.noS3_ICA.261.