Perhaps you should try some spelling variations:
yulan zhang » xiulan zhang, yan zhang, yuan chang
zhang ming » zhang xin
chen yulan » chen yugang, chen yulu, chen yun
ming shu » ming shih, cong shu, ming lu
hong ng » hong kong, hong jong, hong hong
dong di » dong sin
y en » y el, _ en, i en
y un » y und, y sun, _ un
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) yan) OR (hong ng))) OR (dong di)) ((y un) OR (y en)) chen yulan zhang ming shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((wang OR wan) yan) or (hong ng))) or (dong di)) ((y un) or (y en)) chen yulan zhang ming shu ;~".
• Adding a wildcard symbol may retrieve word variants: (((((wang OR wan) yan) or (hong ng))) or (dong di)) ((y un) or (y en)) chen yulan zhang ming shu ;*.