Get a bus map whenever you stay in a big city. It's fun traveling by public bus and it is cheap.
In Hanoi it can be a lot of work before you achieve your goal! You need to go to the transportation department.
The Bangkok bus map is fabulous. This is a 2009 example,
sarcophagus has one from around 2002, didn't change a lot though.
Kuala Lumpur bus service is a dog without proper information. Not one bus driver seems to have a clue to where the other lines go.
