Perhaps you should try some spelling variations:
reformen von » formen von, reform von, referaten von
david hong » david ng
liang der » gang der, ding der, liang dan
klang der » klarung der, gang der
von david » john david, ben david, jan david
wan wang » wen wang, yan wang, wang yang
tan » than

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 der) OR (klang der)) reformen von david hong tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan wang ((liang der) OR (klang der)) reformen von david hong tan ;*".