Yes there is a large number of Cambodians living in south-western VietNam. And even when I was there 6 years back there were net cafes in the major cities (I think they were net cafe's.) I've heard mixed reports of their (VietNam's) net reliability also. Let alone other issues like unreliable power supplies. I also believe a high % of comp's over there are 2nd hand ones sold by other countries. That was true some years ago, I don't know about now.