Perhaps you should try some spelling variations:
class dann » class demand
yang liang » wang liang, yan liang, yang yang
one class » one case
dann bin » dong bin
yong jin » yang jin, ying jin, song jin
yang jui » yang judy, yang yi
yang xi » yang yi
bin ce » bin we

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: one class dann bin ce ((((yong jin) OR (yang liang))) OR (yang di)) ((yang jui) OR (yang xi)) ;~.
• Adding a wildcard symbol may retrieve word variants: one class dann bin ce ((((yong jin) or (yang liang))) or (yang di)) ((yang jui) or (yang xi)) ;*.