Perhaps you should try some spelling variations:
bank david » black david, mark david, bank ravi
arg study » emg study, ieg study, meg study
dog study » dem study, did study, emg study
zhong zhi » zhang zhi, zhong tai
die bank » die banken
hong ghi » hong g, hong hai
wang » wing, lang

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: (wang OR wan) yao ((arg study) OR (dog study)) die bank david ((hong ghi) OR (zhong zhi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang or wan) yao ((arg study) or (dog study)) die bank david ((hong ghi) OR (zhong zhi)) ;~".
• Adding a wildcard symbol may retrieve word variants: (wang or wan) yao ((arg study) or (dog study)) die bank david ((hong ghi) OR (zhong zhi)) ;*.