Perhaps you should try some spelling variations:
reformen von » formen von, referaten von, reformen der
reform von » form von
david hong » david ng
liang wei » xiang wei, zhang wei, fang wei
wan wang » wen wang, yan wang, wang yang
wang wei » zhang wei, wang zhi
tan » than

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