Perhaps you should try some spelling variations:
wang liang » wang yang
boon siong » soon siong, boon chong
siong cong » song chong
yang yang » wang yang, wang yan
chen boon » cheng boon, chor boon, chen john
cong van » congo can, duong van, cong sun
a chen » ta chen, _ chen, n chen

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: qian ((((wang liang) OR (you liangzhi))) OR (yang yang)) a chen boon siong cong van ;~.
• Adding a wildcard symbol may retrieve word variants: qian ((((wang liang) or (you liangzhi))) or (yang yang)) a chen boon siong cong van ;*.