- From 1993 to 2003, Le Trung Thanh had been working for Lam Son Sugarcane Joint Stock Corporation as a director of Hanoi branch. In the next 2 years, he became Deputy General Director of Lam Son Sugarcane Joint Stock Corporation.
- From 2007 to early 2016, he has undertook many other positions, such as Director of Lam Son Tourism and Trade Company, Director of Lam Son Trade Center, Deputy General Director of Trade and others. He was also Deputy Chairman of the Board of Representatives of Vietnam's leading Company investment fund.
- From the end of 2016 until now, Le Trung Thanh is currently the vice chairman of Lam Son Sugarcane Joint Stock Corporation and Chairman of the Board of Directors of Nong Cong Sugarcane Joint Stock Corporation.