Perhaps you should try some spelling variations:
cases when » cases where, cases what, games when
when song » when songs, when so, when soft
doing un » doing und, doing our, doing von
song min » song ming, gong min, jong min
yang jun » yang jui, pang jun, yang jin
un dann » und dann, um dann, bin dann
yang xi » yang jui
yang yi » yang jui

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: doing un dann cases when song min ((((yang jun) OR (yang xi))) OR (((yang di) OR (yang yi)))) ;~.
• Adding a wildcard symbol may retrieve word variants: doing un dann cases when song min ((((yang jun) or (yang xi))) or (((yang di) or (yang yi)))) ;*.