Perhaps you should try some spelling variations:
associated infection » associated infections
associate director » associated vector
associate editors » associated factors, associated pastors, associated operators
associate factor » associated factors, associated vector, associated fatty

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 editors) OR (associate director))) OR (((associate factor) OR (associated infection)))).
• Adding a wildcard symbol may retrieve word variants: ((((associate editors) or (associate director))) or (((associate factor) or (associated infection))))*.