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

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