Perhaps you should try some spelling variations:
yulan zhang » xiulan zhang, yan zhang, yuan chang
chen yulan » chen yugang, chen yulu, chen yun
hong ng » hong kong, hong jong, hong hong
dong di » dong sin
long du » long d, long do, long did
n chen » _ chen, a chen, z chen
y n » y en, y un
wang » wing, wan, 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 yan) OR (hong ng))) OR (dong di)) y n chen yulan zhang ((long du) OR (long run)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((wang yan) or (hong ng))) or (dong di)) y n chen yulan zhang ((long du) OR (long run)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((((wang yan) or (hong ng))) or (dong di)) y n chen yulan zhang ((long du) OR (long run)) ;*.