Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
dong sein » dong sin, dong bin, ong sean
yang july » yang judy, yang jui, yang jun
dong wei » wang wei, dong di, dong hoi
kann nur » kann der, kann er, kann um
yang yun » yang jun, tang yun, yang yue
kann yu » wann yu
zhang i » zhang ii, zhang li, zhang si

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: ((dong sein) OR (dong wei)) ((kann yu) OR (kann nur)) cheng zhang i ((yang yun) OR (yang july)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong sein) or (dong wei)) ((kann yu) OR (kann nur)) cheng zhang i ((yang yun) or (yang july)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong sein) or (dong wei)) ((kann yu) OR (kann nur)) cheng zhang i ((yang yun) or (yang july)) ;*.