Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong hsun » chang hsun, chung hsuan, chong suk
hsun cheng » su cheng
shang hai » shang kai, dang hai, chang ha
ying jin » yang jin, jing ji, yang jie
yang xi » yang di, yang jui
yang yi » yang di, yang jui
a boon » a book

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: a boon chong hsun cheng ((((yang xi) OR (ying jin))) OR (yang yi)) shang hai ;~.
• Adding a wildcard symbol may retrieve word variants: a boon chong hsun cheng ((((yang xi) or (ying jin))) or (yang yi)) shang hai ;*.