Perhaps you should try some spelling variations:
class dong » class doing, class do
one class » one case
song min » song ming, gong min, jong min
yan guan » gan guan, yan yuan, yang guang
yang jie » yang jin, yang di, yang jui
yang xi » yang di, yang yi, yang jui
sin ce » since ce

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 dong sin ce ((((song min) OR (yan guan))) OR (yang jie)) ((wang yan) OR (yang xi)) ;~.
• Adding a wildcard symbol may retrieve word variants: one class dong sin ce ((((song min) or (yan guan))) or (yang jie)) ((wang yan) or (yang xi)) ;*.