On return trip from Hanoi I would like to bring back 10kg (or more) ground coffee in vacuum sealed packets.

Is there a recommended place to go where there is selection bigger/better than ordinary supermarket?

Separate question about one kind of coffee I tried during my previous trip which I was told coming from the border with Cambodia. It has slight chocolate flavor. If you know what I am talking about, could you tell what brand/packaging looks like?

Thanks