Perhaps you should try some spelling variations:
yan zhang » yuan chang, bin zhang, han chang
shang kai » shang hai
wei chen » wei shen, jui chen, yi chen
yang jie » yang jin, yang di, yang yi
yang jui » yang judy, yang di, yang yi
ran yan » nan yan, ren yan, wang yan
yang xi » yang di, yang yi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ran yan zhang ((wei chen) or (frei chen)) ((((yang jie) OR (yang jui))) or (yang xi)) shang kai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ran yan zhang ((wei chen) OR (frei chen)) ((((yang jie) OR (yang jui))) OR (yang xi)) shang kai ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ran yan zhang ((wei chen) or (frei chen)) ((((yang jie) OR (yang jui))) or (yang xi)) shang kai ;*".