Perhaps you should try some spelling variations:
"state sector" » "estate sector", "state vectors", "state section"
"state vector" » "space vector"
"state actor" » "state action", "state after", "state acts"
"state actors" » "state actions", "state afters", "state actss", "state factors"
"state actss" » "state acts", "state access", "state across"

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