Gia Khanh B. GOVERNANCE IN NORTHWESTERN VIETNAM UNDER THE NGUYỄN DYNASTY (1802–1884): SEEN THROUGH THE THỔ QUAN (NATIVE OFFICIALS) – LƯU QUAN (IMPERIALLY APPOINTED OFFICIALS) POLICY. HNUE Journal of Science: Journal of Social Sciences. 2026;71(1):58-69. doi:10.18173/2354-1067.2026-0006