For DEMs the place to start almost anywhere on earth is the SRTM data. The Seamless server: http://seamless.usgs.gov/ has 3 arc-second DEMs for Viet Nam: I just downloaded a chunk and it looks fine.
Thanks, USGS!
There's a cleaned-up version at: http://www.shadedrelief.com/cleantopo2/index.html but it's 2-arc-minute resolution.
Don Cooke, GDT Founder, Tele Atlas. Check out my book "Fun with GPS" ESRI Press!
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