Perhaps you should try some spelling variations:
yulan chang » yuan chang, xiulan zhang
chen yulan » chen yugang, chen yulu, chen yun
wang yang » wang yan, wang liang, wang yanling
long kong » hong kong, king kong, long bond
chang ann » chang min, chang won, chang yun
ann sein » und sein, au sein, als sein
et a » et al, et la, e a
y a » y la

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 yang) OR (long kong))) OR (dong sin)) ((y a) OR (et a)) chen yulan chang ann sein ;~.
• Adding a wildcard symbol may retrieve word variants: ((((wang yang) or (long kong))) or (dong sin)) ((y a) or (et a)) chen yulan chang ann sein ;*.