Man was a member of the Standing Committee of Quang Binh. On 21 November 2015, the Standing Committee of the Quang Binh Provincial Party Committee assigned Man to hold the position of Commander of the Military Command of Quang Binh province. Man served in this position for 5 years.[3] On 20 May 2019, the Prime Minister of Vietnam Nguyen Xuan Phuc appointed Colonel Man as Deputy Commander of the Military Region 4, People's Army of Vietnam, and promoted him to Major General.[4][5] On October 10, 2020, Man attended a ceremony to commemorate the 7th anniversary of the 4th Military Region of the Vietnam People's Army. At the meeting, Man's superiors contacted him and ordered him to Thua Thien-Hue, a place that was flooded by Tropical Storm Linfa. This would be his last mission.[5]
Man was also a politician who participated in National Assemblies. On 7 November 2016, discussing the bill on the use of weapons, explosives and supporting tools, he argued that the federal government should divert more money from the Ministry of Public Security to the Ministry of Defense.[6] On the morning of 24 May 2018, at the Discussion on the Denunciation Law project at the 5th session of the 14th National Assembly, he stated that protection for whistleblowers were necessary, since many face threats in Vietnam.[7]