Trần Đức AS. Role of the Vietnamese Diplomatic Envoys in Trade between Vietnam and China during the 18-19 Centuries. daujs [Internet]. 31 Tháng Chạp 2024 [cited 9 Tháng Giêng 2025];3(4). Available at: https://js.donga.edu.vn/index.php/daujs/article/view/405