Can a foreigner own a house/land in Vietnam? If so, when did this law come into effect?

Ask:I am interested in developing in Vietnam, but worried about buying property. I know the law didn't allow it some time back, and I would like to know if it changed recently.

What is the worth of dong in Vietnam?

How much can buy what, I haven't been there since I was small and most of my family hasn't been there in a while. I want to send my father and brother in law some money, but I don't know how much to send, because I know their money isn't worth as much...