How much does a house cost in Vietnam in Dong?

Excuse me, could you please elaborate on the pricing of houses in Vietnam, specifically in terms of the Vietnamese Dong currency? I'm interested in knowing the general range or average cost of a residential property in the country, as I'm considering potential investment opportunities. Is there a significant variation in prices depending on location, such as urban versus rural areas, or are there any other factors that significantly impact the cost of housing in Vietnam?