Lương's official portrait as a member of the National Assembly, 1968
He first started off his political career by serving on the Phước Long Provincial Council and mayor of Phước Long province.[4]
He was first elected to the House of Representatives (Lower House) in the 1967 South Vietnamese parliamentary election, representing Phước Long province.[5] He assumed office on 31 October 1967.[6]
In January 1968 after being elected as the Speaker of the House of Representatives,[7] in his first speech to the Lower House, Luong stressed the election of the House of Representatives was a landmark in the emergence of the Second Republic of Vietnam. He added that the Lower House should cooperate closely with the Upper House (Senate) to regulate the executive and judicial branches of government.[8]
On 7 April 1968, Luong convened a session in the Lower House to discuss details of negotiations the US plan to address with Democratic Republic of Vietnam in the 1968 bilateral talks, which would eventually lead to the 1973 Paris Peace Accords. In that session, he issued a stark warning to the US saying, "Any decision relating to the future of the Republic of Vietnam and not approved by the elected government and the National Assembly of the Republic of Vietnam will be considered as void and a betrayal of the Vietnamese people."[9]
On 28 September 1968, Speaker Lương opposed UN Secretary GeneralU Thant's decision to get the United Nations General Assembly to order the US to stop the bombing of North Vietnam.[10] Talking with the press, regarding Thant's proposal, Speaker Lương expressed, "Mr. Thant has shown that he is not impartial."[11] He further mentions UN Secretary General U Thant of being biased and favoring the North Vietnamese communists. Speaker Lương emphasized that the South Vietnamese are fighting in self-defense in a war waged by the North Vietnamese communists. Therefore, Speaker Lương states, "why not tell the North Vietnamese to withdraw their troops."[12] According to Speaker Lương the goal of bombing North Vietnam is to stop the infiltration of communist troops and weapons into the South.[13]
After President Nguyễn Văn Thiệu's speech to the joint session of the National Assembly of the Republic of Vietnam on 2 November 1968, Speaker Lương and along with other lawmakers marched to the Independence Palace demanding Thiệus' and Vice President Nguyễn Cao Kỳ's responses on what the future of South Vietnam would be like if the US were to abandon them.[14]
On 8 April 1969, at the first meeting session of the 1969-1970 congress of the Lower House, at the start of the session Speaker Lương called for the unity of all political parties because he believed being united will help build an efficient government. He further stressed that it is the responsibility of all of the deputies to unite political ideas and the populace to help combat against the Communists in the war.[15]
In early 1970, He granted permission for the arrest of fellow Deputy Trần Ngọc Châu who has been accused by President Thiệu of having connections to the Viet Cong and helping them maintain territory within South Vietnam. President Thiệu furthering declaring that Deputy Trần Ngọc Châu posed a threat to the country's national defense.[17]
On 23 April 1970, Luong sent a letter to the President of the Cambodian National Assembly, the acting Cambodian Chief of State Cheng Heng, and the Cambodian Prime Minister Lon Nol to take appropriate measures to protect the lives and properties of Vietnamese nationals living in Cambodia. Luong and other members of the Lower House expressed, "More than anyone else, they are upset by the news that the lives and properties of a large number of Vietnamese nationals have suffered heavy losses."[18]
On 30 May 1970, Lương and other members of South Vietnam's leadership attended the funeral of the late Chief of State Phan Khắc Sửu in Saigon. He expressed deep sorrow for Sửu's passing and praised Sửu as a great revolutionary.[19]
On 14 January 1971, Speaker Lương led a delegation of ten members of the National Assembly to Taipei for a five-day visit. Once arriving at the airport Speaker Lương express to reporters that the relationship between the Republic of China and the Republic of Vietnam is close, and the two nations have many similarities in culture and customs. He hopes that this visit to China will further promote the friendship and cooperation between the two countries.[20]