Perhaps you should try some spelling variations:
ratings risk » patients risk
among east » among breast, among ers, among health
yang yang » wang yang, wang yan
bank bond » bank bonds
can bond » cat bond, can bonus, a bond
yan yan » yan yuan, nan yan, wang yan
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 yan) OR (yang yang)) ((can bond) or (bank bond)) ratings risk among east ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan yan) OR (yang yang)) ((can bond) OR (bank bond)) ratings risk among east ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan yan) OR (yang yang)) ((can bond) or (bank bond)) ratings risk among east ;*".