Perhaps you should try some spelling variations:
chen yang » chen rong
yang yulu » yang yue, yang yun
yang john » young john, king john, yang jin
mang yul » wang yue, sang yu, tang yun
bonn sau » bonn am, bonn auf, bonn das
bonn a » bonn am, bonn _, bon a
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 ((yang yulu) OR (mang yul)) chen yang john ((bonn sau) or (bonn a)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ((yang yulu) OR (mang yul)) chen yang john ((bonn sau) OR (bonn a)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((yang yulu) OR (mang yul)) chen yang john ((bonn sau) or (bonn a)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yan ((yang yulu) OR (mang yul)) chen yang john ((bonn sau) or (bonn a)) ;*.