hope you didn't go chinatown yet, coz there is a big mistake - GREENBORO is near South Keys area which is very far away from chinatown. and i don't think that direction is very clear for you.
here you go...
-->bus #95: to Orleans
-->get off bus at WESTBORO, go upstairs, pass hallway
-->bus #2: to Blair
you will see 168 market, many chinese restaurants, and 九龙 market along somerset street.
well, this is a way taking longer time, but you'r able to get off bus at the front of any chinese stores which you like.
however, there is a shortcut which you only need take bus #95, and get off a place (sorry, don't remember the street name, you may ask your friends or the people in chinatown when you are there), then walk for couple of minutes to get 九龙 market directly. if you want to get other chinese stores, you have to take bus #2 again along somerset street.
good luck!