History of the Loss of Vietnam ( , ) was a Văn ngôn book written by Phan Bội Châu, the leading Vietnamese anti-colonial revolutionary of the early 20th century, in 1905 while he was in Japan.David G Marr Vietnamese Tradition on Trial, 1920-1945 1984 Page 255 "Works by Phan Boi Chau of particular historiographical significance are Viet-Nam Vong Quoc Su (History of the Loss of Vietnam], written in 1905, and Viet-Nam Quoc Su Khao [A Study of Vietnam's National History], written in 1909. SPT-2, pp."Spencer C. Tucker The Encyclopedia of the Vietnam War: A Political, Social, and Military History. 2011 Page 901 "He penned Viet Nam Vong Quoc Su (History of the Loss of Vietnam), a complaint about the weak Nguyen dynasty leadership and an urgent call for a nationwide resistance."
