Perhaps you should try some spelling variations:
reformen von » formen von, reform von, referaten von
david hong » david ng
daun yang » du yang, tan yang, un yang
klang iii » klang die, zwang iii
von david » john david, ben david, jan david
dan yang » tan yang, wang yang, yang yang
liang li » ling li, qiang li, liang wei
hong ghi » zhong zhi, hong g, hong hai

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: ((dan yang) OR (daun yang)) ((klang iii) OR (liang li)) reformen von david hong ghi ;~.
• Adding a wildcard symbol may retrieve word variants: ((dan yang) or (daun yang)) ((klang iii) or (liang li)) reformen von david hong ghi ;*.