In 1997, 'The omitted history of Dai Nam & the Vietnamese history compared with Chinese history was published to commemorate the 50th anniversary of the death of the author, the revolutionary martyr Nguyen Van To (1889-1947). After 22 years, the book was reprinted. The re-publication of the book is a must, because the content of the book "arouses patriotism" for any Vietnamese who reads it. The book consists of two main parts, the first section recording historical events that have been omitted or not recorded in orthodox history; The second part analyzes Vietnam's historical events and compares them with the history of China. In part 2, the author studies two major issues: studying places related to the territory of Vietnam in history such as Giao Chi, Van Lang, Xich Quy, Nam Giao, Au Lac, Nam Viet, Van Xuan, An Nam, Tinh Hai ...; studying the rebellions during the Northern domination period. Both issues are meticulously researched by the author, using very extensive references.