Perhaps you should try some spelling variations:
doing von » doing un, ing von
coal mine » coal mines
coal min » coal mines, coal oil, coal pit
yang yun » yang jun, tang yun, yang yue
von dan » von dana, von den, von daf
ii when » xxii when, ii where, ii wesen
yang xi » yang yi, yang jui
dan ii » daten ii

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doing von dan ii when ((coal min) OR (coal mine)) ((yang yun) or (((yang xi) or (yang di)))) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doing von dan ii when ((coal min) OR (coal mine)) ((yang yun) OR (((yang xi) OR (yang di)))) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doing von dan ii when ((coal min) OR (coal mine)) ((yang yun) or (((yang xi) or (yang di)))) ;*".