Origins of the Tay Son Dynasty ; Cuon sach dan nguoi đoc vao hanh trinh truy tam: tu boi canh Đong Nam A cuoi the ky 18, đen nhung bien đong ngoai giao giua nha Tay Son va nha Thanh; tu nhung van thu gui sang Trung Hoa cua Nguyen Hue cho đen viec giai ma gia pha, dong toc, va phan tich cach thuc nguon goc đuoc ghi trong van ban dan gian, truyen thuyet va cac tai lieu ngoai quoc. Anh em Tay Son co that su que o Nghe An? Ho co phai la dong doi ho Ho nhu mot so ghi chep ngoai su lieu cho rang? Va viec xay dung nguon goc nay mang y nghia gi ve mat chinh tri – quyen luc? Tac gia moi ban đoc cung đat lai cau hoi va can nhac cac gia thiet tren co so tu lieu đa chieu. ; The book leads readers on a journey of tracing: from the context of Southeast Asia at the end of the 18th century, to the diplomatic upheavals between the Tay Son and Qing dynasties; from Nguyen Hue's documents sent to China to deciphering genealogy, clan, and analyzing how the origins are recorded in folk texts, legends, and foreign documents. Are the Tay Son brothers really rooted in Nghe An? Are they descendants of the Ho family as some non-historical records suggest? And what does building this source mean in terms of politics – power? The author invites readers to re-ask questions and consider hypotheses on the basis of multi-dimensional documents.