Perhaps you should try some spelling variations:
boon chang » boon chong, joon chang, hoong chang
chang hsu » chang hsun, chang su, chang ha
yang jui » yang judy, yang xi
yang jin » yang jie, yang jun, ying jin
hsu shi » hsu chin
yang yi » yang xi
a boon » a book
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: a boon chang hsu shi ((((((yang jui) OR (yang jin))) OR (yang di))) OR (yang yi)) dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: a boon chang hsu shi ((((((yang jui) or (yang jin))) or (yang di))) or (yang yi)) dang hai ;*.