Perhaps you should try some spelling variations:
boon chong » boon siong
joon chang » hoong chang, jin chang, woo chang
yang yang » wang yang, wang yan
test ying » test using, test playing
dong nan » dong yang, dong sin, dong bin
lang 2 » lang 3, lang _
lang a » lang 3, lang _, erlang a

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: ((dong nan) OR (yang yang)) ((lang 2) OR (lang a)) test ying ((joon chang) OR (boon chong)) jin ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong nan) or (yang yang)) ((lang 2) OR (lang a)) test ying ((joon chang) or (boon chong)) jin ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong nan) or (yang yang)) ((lang 2) OR (lang a)) test ying ((joon chang) or (boon chong)) jin ;*.