Perhaps you should try some spelling variations:
"state factors" » "states factors", "state actors", "state factory", "stable factors", "state reactors", "state actorss"
"state sector" » "estate sector", "state vectors", "state section"
"state vector" » "space vector"
"state factor" » "stable factor", "state reactor", "state actors"
"state actor" » "state actors", "state action", "state after"

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: (((("state actor") OR ((("state sector") OR ("state vector"))))) OR ((("state factors") OR ("state factor")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"state actor\") or (((\"state sector\") or (\"state vector\"))))) or (((\"state factors\") OR (\"state factor\"))))".
• Removing quotes may allow a broader search: (((( state actor ) or ((( state sector ) or ( state vector ))))) or ((( state factors ) OR ( state factor )))).
• Adding a wildcard symbol may retrieve word variants: (((("state actor") or ((("state sector") or ("state vector"))))) or ((("state factors") OR ("state factor"))))*.