Perhaps you should try some spelling variations:
close patients » care patients, les patients, cleft patients
wang yang » wang yan, wang liang, wang yanling
era among » erm among, euro among, pca among
yang can » yang dean, yang yang, yang jin
yang fan » zhang fan, yang dean, yang yang
eu among » bu among, euro among, erm among

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ((yang can) or (yang fan)) close patients ((eu among) OR (era among)) letters ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ((yang can) OR (yang fan)) close patients ((eu among) OR (era among)) letters ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang ((yang can) or (yang fan)) close patients ((eu among) OR (era among)) letters ;*".