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 (((associated vector) OR (associated secretory))))) OR (associate factor)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((associate editor) or (associate director))) or (((associated vector) OR (associated secretory))))) or (associate factor))".
• Adding a wildcard symbol may retrieve word variants: ((((((associate editor) or (associate director))) or (((associated vector) OR (associated secretory))))) or (associate factor))*.