Perhaps you should try some spelling variations:
case dann » case anna, case anne, case das
dann buch » dann auch, das buch, dann doch
wang yang » wang yan, wang liang, wang yanling
one case » some case, one class, one phase
buch der » bruch der
song jin » song min, shang jin, song shin
ying jin » yang jin, jing ji, yang jie
yang jun » yang jui, pang jun, yang jin

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 case dann buch der ((((song jin) OR (wang yang))) OR (ying jin)) ((yang jun) OR (yang di)) ;~.
• Adding a wildcard symbol may retrieve word variants: one case dann buch der ((((song jin) or (wang yang))) or (ying jin)) ((yang jun) or (yang di)) ;*.