Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong yun » chang yun, hong yu, chen yun
yun cheng » yuan cheng, yu cheng, yun chen
shang hai » shang kai, dang hai, chang ha
tan boon » tan soon, a boon, ar boon
yang jie » yang jui, yang xi, yang jun
yang jin » yang jun, ying jin, shang jin
yang yi » yang xi, yang jui

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: tan boon chong yun cheng ((((yang jie) OR (yang jin))) OR (((yang yi) OR (yang di)))) shang hai ;~.
• Adding a wildcard symbol may retrieve word variants: tan boon chong yun cheng ((((yang jie) or (yang jin))) or (((yang yi) or (yang di)))) shang hai ;*.