Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong yuan » chong yun, chang yun, chong wan
yuan cheng » yuan chang, huang cheng, yu cheng
shang hai » shang kai, dang hai, chang ha
tan boon » tan soon, a boon, ar boon
yang jie » yang jin, yang jui, yang xi
ying jin » yang jin, jing ji
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 yuan cheng ((((yang jie) OR (ying jin))) OR (((yang yi) OR (yang di)))) shang hai ;~.
• Adding a wildcard symbol may retrieve word variants: tan boon chong yuan cheng ((((yang jie) or (ying jin))) or (((yang yi) or (yang di)))) shang hai ;*.