Perhaps you should try some spelling variations:
"state sector" » "estate sector", "state vector", "state vectors"
"state actor" » "state action", "state vector", "state after"
"state actors" » "state actions", "state vectors", "state afters", "state factors"

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