Perhaps you should try some spelling variations:
class doing » class housing, class living
yang guang » yang yang, yan guan, yang liang
one class » one case
doing sin » dong sin, doing un, doing von
gong meng » gong gang, gong min
ying jin » yang jin, jing ji, yang jie
yang yue » wang yue, yang yun, yang jui
yang yi » yang di, yang xi, 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 doing sin ce ((((gong meng) OR (yang guang))) OR (ying jin)) ((yang yue) OR (yang yi)) ;~.
• Adding a wildcard symbol may retrieve word variants: one class doing sin ce ((((gong meng) or (yang guang))) or (ying jin)) ((yang yue) or (yang yi)) ;*.