Phạm Duy Tốn | Phạm Duy | Nguyễn Ngọc Loan | To Ngoc Van | Thao people | Phạm Quang Nghị | Pham Quang Nghi | Pham Hong Son | Phạm Du | Phạm Bỉnh Di | Nguyễn Thị Ngọc Hoa | Ngọc Sơn | Ngoc Son | Andrew X. Pham |
Despite this, he continued to collaborate with his former superiors, Lam Van Phat and Pham Ngoc Thao in the organisation of several coup attempts against the then military leader Nguyen Khanh on 19 February 1965.
One of Khiêm's subordinates, Phạm Ngọc Thảo, a Communist double agent, was planning one of the many coup plots that engulfed Saigon and destabilised the regime, with the help of Trần Kim Tuyến.