Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong won » chang won, chong wan, choong wan
yan tang » yang yang, tang tang, yan liang
yan wang » yuan wang, yang yang, qian wang
wan yan » wang yan, nan yan, wai yan
dong di » dong sin
won sin » dong sin, von sinn, wong siu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wan yan) or (dong di)) nan ((yan tang) or (yan wang)) boon chong won sin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wan yan) OR (dong di)) nan ((yan tang) OR (yan wang)) boon chong won sin ;*.