Vietnam forum

My partner and I would really like to give some of our time while we are in Vietnam and are about to head to Hanoi. I have been sifted through various online advertisements where clearly what they need instead of a couple of extra people around to help is just money. Much as we would love to oblige we don't have enough to spare to pay huge volunteer fees, we also feel that if they are charging you loads to come in then realy going there is a benefit to you not to the people. Anywho if anywhere knows any good places we would be grateful for a message x