Perhaps you should try some spelling variations:
wei referat » wien referat, dem referat, i referat
wang liang » wang yang
john david » cohen david, sahn david, juan david
alan david » kaplan david, juan david, bulman david
liang wei » xiang wei, zhang wei, wang wei
jan david » juan david, sahn david, ben david
wan wang » wen wang, yan wang, wang yang
ng tan » hong tan, wing tan

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 referat ((((jan david) OR (john david))) or (alan david)) ng tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan wang liang wei referat ((((jan david) OR (john david))) OR (alan david)) ng tan ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan wang liang wei referat ((((jan david) OR (john david))) or (alan david)) ng tan ;*".