Not at all. A war? Unlikely for some time. It's just an arms race right now with China being significantly ahead of everyone there. Vietnam doesn't have the resources to fight a long term war and they would be absolutely destroyed by air and sea. Some may think that "defeating" (eh, that depends on the interpretation) China back in 1979 means they're still capable of doing it again. Not with the modernization that China has done, Vietnam would get wrecked hence why they've been trying to get many of the SE nations on their side. The problem is the Chinese have manifested themselves in many governments in nations within that region and have established a large amount of political sway. Nations such as Cambodia (who also dislike Vietnam for the occupation even though Vietnam got rid of Pol Pot for them) seem to side with China. Japan is showing support but I doubt they could do much during times of war unless their legislation allows for it by altering the constitution.
Aside from that, the Vietnamese who fled Vietnam after the war are more interested in getting the world to destabilize the current Vietnamese regime and try to hang the former flag. That's all they seem to really care about with all the rallies they participate in. They don't seem to realize that if the Vietnamese regime is gone, that gives incentive for a larger power to stabilize the country through puppets or use that time period of instability to claim more islands in that region. There's not enough political pressure on China for the asinine claims they make.