Perhaps you should try some spelling variations:
boon chong » boon siong, joon chang
chong you » chang you, thing you, chong yah
you chen » you when, you chenli, you check
yang jui » yang judy, yang xi
yang jin » yang jie, yang jun, ying jin
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 chong you chen ((((((yang yi) OR (yang jui))) OR (yang jin))) OR (yang di)) dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: a boon chong you chen ((((((yang yi) or (yang jui))) or (yang jin))) or (yang di)) dang hai ;*.