Perhaps you should try some spelling variations:
reformen von » formen von, referaten von, reformen der
wang liang » wang yang
reform von » form von
liang wei » xiang wei, zhang wei, wang wei
wan wang » wen wang, yan wang, wang yang
david ng » david n, david a, david _
david g » david a, david _, david k

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