| 1972 |
As an electric-mechanic engineer join Ministry of Foreign Affaires of Vietnam. |
| 1972-81 |
Work at the Soviet Union Department of the Ministry and the Vietnam Embassy in Moscow. |
| 1982-84 |
Study at Diplomatic Academy. Moscow. |
| 1984-92 |
work at Policy Planning Department of the Ministry. |
| 1992-95 |
Vietnam Ambassador to Japan. |
| 1995-2001 |
Deputy Minister of Foreign Affaires and Vietnam SOM leader in ASEAN. |
| 2001-2007 |
Vietnam Ambassador to the US. |
| 2008 to present |
Senior Advisor, Diplomatic Academy of Vietnam. |
