I suspect this is a homework question. Since I have already graduated, I am not going to do your work for you. I did find a link that may help you. (You could have found it and others by doing an internet search using the phrase United Nations stance on Vietnam war")
http://www.americanforeignrelations.com/E-N/Neutralism-The-united-nations-vietnam-and-d-tente.html
If you need more info, do the search listed above.