In March 1929, radical members of the Vietnam Revolutionary Youth League (VARY) including Trần Văn Cung, Nguyễn Đức Cảnh, Trịnh Đình Cửu, Đỗ Ngọc Du, Dương Hạc Đính, Ngô Gia Tự, Kim Tôn formed the first communist cell in French Indochina.
Together with Trịnh Đình Cửu and Kim Tôn he was voted to attend the congress of VARY, held in Hong Kong in May 1929.
On 17 June 1929, the cell met in Hanoi and decided to form the Communist Party of Indochina.
They issued the party's political proclamation, led by Trịnh Đình Cửu, Nguyễn Đức Cảnh, Ngô Gia Tự, Trần Văn Cung.
The party published Búa Liềm (Hammer and Sickle) newspaper.