Thu Hien N, Thi Thanh Hien L, Phuong Mai L. THE RELATIONSHIP BETWEEN CENTRAL AND LOCAL AUTHORITIES IN THE GOVERNANCE MECHANISM OF THE NORTHERN FRONTIER UNDER THE LÝ DYNASTY (1009-1226). HNUE Journal of Science: Journal of Social Sciences. 2026;71(2):98-108. doi:10.18173/2354-1067.2026-0029