Perhaps you should try some spelling variations:
doing von » doing un, ing von
when song » when songs, when so, when soft
song ming » song bing, song min, gong min
dong cao » dong xiao, dong nan, yong cai
yang jun » yang jui, pang jun, yang jin
dan cao » dan cao's
yang yi » yang xi, 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 von ((dong cao) OR (dan cao)) when song ming ((yang jun) OR (((yang di) OR (yang yi)))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doing von ((dong cao) OR (dan cao)) when song ming ((yang jun) or (((yang di) or (yang yi)))) ;~".
• Adding a wildcard symbol may retrieve word variants: doing von ((dong cao) OR (dan cao)) when song ming ((yang jun) or (((yang di) or (yang yi)))) ;*.