honestly I think that it's a great chance to lose money. The process of buying is full of potholes and unknowns.
Last year Foreigners has currently facing problems gaining title from the Land Registration Office after purchasing real estate, even under the new ownership laws.
I like the Vietnamese, but they have a bureaucracy that is not at all transparent, in fact, just the opposite. Just look at virtually any question here dealing with the law, immigration, visas, etc. There is never just one answer.