Try and get the viet bean, and get it ground the way they do it too. It's usually a mild flavour... but with the sweetened condensed milk it can be very sweet. Plus you can make it on your desk! Mostly I don't drink it sweetened, but that's the way they mostly do it, so for this video I did that too :)
Here is a much better video on how to make Vietnamese style coffee... great song too!