Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong you » chang you, thing you, chong yah
dang hadi » dang hai
you chen » you when, you chenli, you check
yang jie » yang jin, yang di, yang jui
ha boon » a boon, ha joon
yang yi » yang di, 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: ha boon chong you chen ((yang jie) OR (yang yi)) dang hadi ;~.
• Adding a wildcard symbol may retrieve word variants: ha boon chong you chen ((yang jie) or (yang yi)) dang hadi ;*.