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
wan boon » a boon, ar boon
yang jun » pang jun, yang jin, yang judy
yang jui » yang judy, yang xi, yang yi
hai » hadi, haji, hari

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: wan boon chong yung chen ((yang jun) OR (((yang di) OR (yang jui)))) dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: wan boon chong yung chen ((yang jun) or (((yang di) or (yang jui)))) dang hai ;*.