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