Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
dang hadi » dang hai
wan boon » a boon, ar boon
chong yu » chong yun, hong yu, chong yi
yang jin » yang jie, yang jun, ying jin
yu chen » yu cheng, yi chen, yulu chen
yang yi » yang xi, yang jui

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan boon chong yu chen ((yang jin) or (((yang yi) or (yang di)))) dang hadi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan boon chong yu chen ((yang jin) OR (((yang yi) OR (yang di)))) dang hadi ;*.