Perhaps you should try some spelling variations:
tuan hua » tan hua, tuan vu, yuan hui
hua chen » jui chen, yu chen, a chen
chen loo » chen hao, chen co, chen l
loo john » longo john, cox john, seo john
wong sam » wong sau, wong lai, kong sar
wan yan » wang yan, nan yan, wang yang
wai yan » wang yan, wei yang

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 yan) OR (wai yan)) tuan hua chen loo john ((wong sam) OR (kong (sar OR saur))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) OR (wai yan)) tuan hua chen loo john ((wong sam) or (kong (sar or saur))) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan yan) OR (wai yan)) tuan hua chen loo john ((wong sam) or (kong (sar or saur))) ;*.