東方勤労者共産大学
In 1931, Kien was caught by Japanese force in Manchukuo on the way to Soviet Union to attend the Communist University of the Toilers of the East. From 1933 to 1934, he studied at Communist University of the Toilers of the East in Moscow. In 1934, Kien went to Hong Kong where he became a member of the Central Committee of the Communist Party of Vietnam in 1935. In 1941, Kien was caught and beheaded by French in Cao Bằng Province. Presently, some roads, streets, schools, and communes or wards in Vietnam are named after him.