Perhaps you should try some spelling variations:
wang dong » wang yong, wang yang, wang jing
wang hong » wang yong, wang hyoung, wang lihong
yang hua » wang hua, yang hui, ying hua
hua chen » jui chen, yu chen, a chen
chen yan » chen yang, chen tan, chen yun
yan john » ryan john, gain john, tian john
song sau » kong sar, song pae, song so
wong sau » wong sam, wong siu, wong shiu

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: ((wang dong) OR (wang hong)) yang hua chen yan john ((song sau) OR (wong sau)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang dong) or (wang hong)) yang hua chen yan john ((song sau) OR (wong sau)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang dong) or (wang hong)) yang hua chen yan john ((song sau) OR (wong sau)) ;*.