Perhaps you should try some spelling variations:
trading room » trading cost, making room
done using » line using, move using
hua credit » dual credit, a credit, ida credit
du credit » de credit, 2 credit
room long » from long, room looking
done sin » dong sin, done so, done fix
long shu » cong shu, tong shui, long du

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: ((done sin) OR (done using)) ya ((hua credit) OR (du credit)) trading room long shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((done sin) or (done using)) ya ((hua credit) OR (du credit)) trading room long shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((done sin) or (done using)) ya ((hua credit) OR (du credit)) trading room long shu ;*.