Perhaps you should try some spelling variations:
yulan zhang » xiulan zhang, yan zhang, yuan chang
chen yulan » chen yugang, chen yulu, chen yun
long shu » tong shui, long du
hong ng » hong kong, hong jong, hong hong
dong di » dong sin
en chen » ern chen, en chef, n chen
y en » y el, _ en, i en
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((wang yan) or (hong ng))) or (dong di)) y en chen yulan zhang ((long shu) OR (cong shu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((wang yan) OR (hong ng))) OR (dong di)) y en chen yulan zhang ((long shu) OR (cong shu)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((wang yan) or (hong ng))) or (dong di)) y en chen yulan zhang ((long shu) OR (cong shu)) ;*".