Perhaps you should try some spelling variations:
den reformen » der reformen, von reformen, die reformen
wei reformen » der reformen, iii reformen, weitere formen
david hong » david ng
von david » john david, ben david, jan david
wan wang » yan wang, wang yang, qian wang
wen wang » wei wang, chen wang, weng fang

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: ((wan wang) OR (wen wang)) liang ((wei reformen) OR (den reformen)) von david hong (tan OR than) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan wang) or (wen wang)) liang ((wei reformen) OR (den reformen)) von david hong (tan or than) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan wang) or (wen wang)) liang ((wei reformen) OR (den reformen)) von david hong (tan or than) ;*.