Perhaps you should try some spelling variations:
der reformen » der reform
reformen von » formen von, reform von, referaten von
wang klang » wang liang, wang yang
david hong » david ng
lang lang » ylang ylang
von david » john david, ben david, jan david
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 klang) OR (lang lang)) der reformen von david hong tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan ((wang klang) OR (lang lang)) der reformen von david hong tan ;*".