I lived in VN for a few years – while you could own apartments, you cannot own land.   May be different for Viet Kieu though.  At any rate,  I think this would be very difficult to finance 

At your age my advice would be to have fun.

There is a juvenile detention facility across the road where I live. Neither it nor its attendees are hardly seen. But it has a reputation that stops property developers from wanting to chop down and develop the forrest that my apartment looks down onto!