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