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