Perhaps you should try some spelling variations:
referaten von » referat von, referat vom
reformen von » formen von, reform von, reformen der
wang liang » wang yang
liang wei » xiang wei, zhang wei, wang wei
zhong tai » hong tan, hong hai, zhong zhi
wan wang » wen wang, yan wang, wang yang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wan wang liang wei ((reformen von) OR (referaten von)) david zhong tai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan wang liang wei ((reformen von) OR (referaten von)) david zhong tai ;*".