answered about 17 months ago by fidsteve
I would take a wander around at the top of the old-quarter just south of Hang Chieu and north of Hang Buom, and, actually, along those two streets as well.
There are lot of beverage distributors in those areas; I cannot say for certain what they do or do not have, but I'm pretty sure I've seen Heineken green, so it's not just Hanoi Beer.