This paper presents and discusses the features of “xuất thế” (exiting from the mundane world” in the thoughts of Nguyễn Trãi (1380-1442), Lê Thánh Tông (1442- 1497), and Nguyễn Bỉnh Khiêm (1491-1585). The three are among great thinkers of Đại Việt (Great Việt, i.e. the contemporary Vietnam) in the medieval period. Despite holding different social positions and being all deeply influenced by the Confucian point of view of “nhập thế”, or “entering into the [mundane/secular] world”, living the context of the three harmonious teachings as one (tam giáo đồng nguyên), they could not avoid the influences of the Taoist and Buddhist stance of “xuất thế”. The author caried out the research to find out the feature of “xuất thế” of these three people revealed in their works. Owing to the syncretism of the three teachings, they had brilliant accomplishments in their lives, contributing in part to a heroic period in the Vietnam’s history.This paper presents and discusses the features of “xuất thế” (exiting from the mundane world” in the thoughts of Nguyễn Trãi (1380-1442), Lê Thánh Tông (1442- 1497), and Nguyễn Bỉnh Khiêm (1491-1585). The three are among great thinkers of Đại Việt (Great Việt, i.e. the contemporary Vietnam) in the medieval period. Despite holding different social positions and being all deeply influenced by the Confucian point of view of “nhập thế”, or “entering into the [mundane/secular] world”, living the context of the three harmonious teachings as one (tam giáo đồng nguyên), they could not avoid the influences of the Taoist and Buddhist stance of “xuất thế”. The author caried out the research to find out the feature of “xuất thế” of these three people revealed in their works. Owing to the syncretism of the three teachings, they had brilliant accomplishments in their lives, contributing in part to a heroic period in the Vietnam’s history.