Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong yung » chong yun, chang yun, zhong yong
yung chen » yun chen, yu chen, yulu chen
dang hadi » dang hai
yang jui » yang judy, yang xi
yang jun » pang jun, yang jin, yang judy
ha boon » a boon, ha joon
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: ha boon chong yung chen ((((yang jui) OR (yang yi))) OR (((yang di) OR (yang jun)))) dang hadi ;~.
• Adding a wildcard symbol may retrieve word variants: ha boon chong yung chen ((((yang jui) or (yang yi))) or (((yang di) or (yang jun)))) dang hadi ;*.