Perhaps you should try some spelling variations:
associated operators » dominated operators
associated factors » associated bacteria
associated vector » associated secretory, associated infection
associate editor » associate editors, associate factor, associated factor

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 operators))))))) 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 (associated operators))))))) or (associated factors))".
• Adding a wildcard symbol may retrieve word variants: ((((associate editor) or (((associate director) or (((associated vector) OR (associated operators))))))) or (associated factors))*.