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