What Instrument is this one? http://img.auctiva.com/imgdata/1/3/9/9/8/3/webimg/57039828_o.jpg?

Question

I think is a mandolin, is made in Viet Nam, but I want to make sure.

Answer 1

I believe you are correct.
Here's a picture of a vietnamese playing a mandolin.
http://www.contemporaryasianart.co.uk/artwork.asp?a=11&b=47
As you can see, it has the exact shape and structure of yours.

Answer 2

yeah thats what it is, search google images .