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

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