Perhaps you should try some spelling variations:
"associated risks" » "associated rna"
"associate rings" » "associative rings", "associates risks", "associate hong"
"associated ring" » "associated rna", "associated risk", "associated driving"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("associate rings") OR ("associated ring"))) OR ("associated risks")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"associate rings\") OR (\"associated ring\"))) or (\"associated risks\"))".
• Removing quotes may allow a broader search: (((( associate rings ) OR ( associated ring ))) or ( associated risks )).
• Adding a wildcard symbol may retrieve word variants: (((("associate rings") OR ("associated ring"))) or ("associated risks"))*.