Perhaps you should try some spelling variations:
class dong » class doing, class do
one class » one case
yang yang » wang yang, wang yan
yang july » yang judy, yang jui, yang jun
song jin » song min, shang jin, song shin
dong di » dong sin
di we » do we, ii we
wang » wing, wan, lang

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 di we ((((song jin) OR (yang yang))) OR (yang july)) ((wang hua) OR (yang di)) ;~.
• Adding a wildcard symbol may retrieve word variants: one class dong di we ((((song jin) or (yang yang))) or (yang july)) ((wang hua) or (yang di)) ;*.