Perhaps you should try some spelling variations:
associated secretory » associated factors, associated operators
associated vector » associated factors, associated infection, associated operators
associate editor » associate editors, associated factor, associated motor
associate factor » associated factors, associate editors, 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 editor) OR (associate director))) OR (((associate factor) OR (((associated vector) OR (associated secretory)))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((associate editor) or (associate director))) or (((associate factor) or (((associated vector) OR (associated secretory))))))".
• Adding a wildcard symbol may retrieve word variants: ((((associate editor) or (associate director))) or (((associate factor) or (((associated vector) OR (associated secretory))))))*.