Perhaps you should try some spelling variations:
reformen der » formen der, reform der
der reformen » der reform
david dang » david ian, david mant, david ng
yuan wang » yuan kang, yuan chang, qian wang
yan wang » yang yang, qian wang, yan liang
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) OR (yuan wang)) yang der reformen der ((david dang) OR (david a)) hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yan wang) OR (yuan wang)) yang der reformen der ((david dang) or (david a)) hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((yan wang) OR (yuan wang)) yang der reformen der ((david dang) or (david a)) hai ;*.