Perhaps you should try some spelling variations:
associate editors » associated factors, associated operators
associated vector » associated factors, associated secretory, associated infection
associate factor » associated factors, 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 (associated vector))) OR (associate factor)).
• Adding a wildcard symbol may retrieve word variants: ((((((associate editors) or (associate director))) or (associated vector))) or (associate factor))*.