The UN wasn't really involved in the Vietnam War. It was more involved in the Korean war which happened a few years earlier. American's fear of commmunism seemed to be cemeted when North Korea attacked South Korea, America then asked the UN intervenean to stop the attack. Eventually they organised a military force to stop the attack.
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Best way to put it, because the USSR had veto power on the Security Council. Note: the reason the UN did get involved in Korea was because the USSR stormed out in protest prior to the vote.
The United States did get involved in the Vietnam war because of communism in Vietnam.
Vietnam war
The Soviet Union (USSR) supplied North Vietnam, and the US fought for South Vietnam.
The Vietnam War might have been avoided, if communism had not been involved.
Korea, Australia, Phillipines, and Canada all pitched in during the Vietnam war alongside the U.S. effort to preserve democracy in South Vietnam.