Perhaps you should try some spelling variations:
der reformen » der reform
reformen der » formen der, reform der
david dang » david ian, david mant, david ng
wang yang » wang yan, wang liang, wang yanling
yan wang » yuan wang, yang yang, qian wang
yang der » gang der, yang dean, klang der

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: yan wang yang der reformen der ((david dang) OR (david a)) hai ;~.
• Adding a wildcard symbol may retrieve word variants: yan wang yang der reformen der ((david dang) or (david a)) hai ;*.