Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong yah » chong nam, chong wan, chong yi
dang hari » dang hai
wan boon » a boon, ar boon
yah chen » yi chen, goh chen, yu chen
yang jie » yang jin, yang jui, yang xi
yang yi » yang xi, yang jui

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wan boon chong yah chen ((((yang jie) OR (yang di))) OR (yang yi)) dang hari ;~.
• Adding a wildcard symbol may retrieve word variants: wan boon chong yah chen ((((yang jie) or (yang di))) or (yang yi)) dang hari ;*.