Thank you, India. But do not be so child-like. India is not a player in China-Vietnam conflict. India exploring oil in Vietnam is good, but India is only a small partner among many others. Vietnam exports equipment to India more than import, and import more agricultural products from India than export (I posted the 2011 trade data in another thread). In trade, India may be as importance to Vietnam as Phillipines and even less important than Thailand, while China is our largest import market and second largest export market.
Regarding security pact with Vietnam, possibly India needs Vietnam help for your defence. Remember that Phung Quang Thanh, Vietnamese minister of Defence, has never been to India, while your Defence Minister has been to Vietnam at least once recently.
If Vietnam need protection against China from any one, the only choice is either US or Russia. We need to cooperate with India for mutual benefit, because India is scared of China even more than us, but it does not mean we need India's protection.