Perhaps you should try some spelling variations:
referaten von » referat von, referat vom
reformen von » formen von, reformen der, reformen _
reform von » form von
david hong » david ng
wang wang » wang yang, wang liang, wang yan
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 wang wei ((((reformen von) OR (referaten von))) OR (reform von)) david hong tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan wang wang wei ((((reformen von) OR (referaten von))) or (reform von)) david hong tan ;~".
• Adding a wildcard symbol may retrieve word variants: wan wang wang wei ((((reformen von) OR (referaten von))) or (reform von)) david hong tan ;*.