Another idea is to use the massive amount of pirated technology on the internet, and marry it with the inexpensive price of photocopy shops in Hanoi and make your own monopoly board.
a basic google search will get you on your way
you could use real VND for Monopoly money, since most of the world seems to deem both to be the same value.
You could use the little figurines that you can buy at tourist shops, like Buddhas (irony noted), ho chi minhs (irony also noted), pigs and turtles and what not for pieces.
Hope that helps
I believe that they are referring to the new Keangnam landmark tower. It is a brand new skyscraper in the My Dinh/Tu Liem section of Hanoi. Among other things it includes a mall, in which is a toy store, which is indeed on the fourth floor of the main tower. This is where you will find your coveted monopoly game.
For some damn reason it isn't listed as a spot itself, but this is a spot for the gardens at the same location
Or just tell a cabbie to take you to the Keangnam building and you will be whisked away to monopoly heaven.