It is a collection of studies that covering the history of Vietnam in the middle ages, mainly from the XV to the XIX centuries by the author Phan Huy Le, with the following topics: Historical sources and approach methods & results. Some major issues & problems of Vietnamese history (such as: the process of national formation; the development of socio-economic forms). Socio-economic issues such as: hired labor, agrarian land’s distribution; traditional village, mining, urbanization, peasant movement. Political institutions such as state organization, Ho dynasty (1390 - 1400) and the reform of Ho Quy Ly (1336 - 1407), legacy of political institutions. Great victories in anti-foreign invasion history. Some prominent historical figures such as Le Loi, Nguyen Trai, Le Thanh Tong, Quang Trung ... The characters who need to re-evaluate as Alexandre de Rhodes, Phan Thanh Gian. Some new discoveries include Nguyen Tuan Thien, Dang Tien Dong, Le Cong Mien. The book is the results of research and discovery work about the history of Vietnam’s authors.