Hoa Hao Street (take note of the spelling, they are two different words) is a long street that is being divided by a stadium. This stadium basically divide the street into two different District. One on District 10 and the other is on District 11. The area you want to search for the leather craft stuff are in the District 11 side. Just try to ask around and you will probably find it. There are quite a number of shops selling tools, leather, PVC leather, rivets, buckles and so on. I didn't get to walk much there due to time limit. Interesting place to explore.