Perhaps you should try some spelling variations:
"estate sector" » "state section", "estate vector", "estate vectors", "estate section"
"state action" » "state reactions"
"state sector" » "state vector", "state vectors", "state section"
"state actors" » "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 action") OR ("state actors"))) OR ((("estate sector") OR ("state sector")))).
• Removing quotes may allow a broader search: (((( state action ) or ( state actors ))) or ((( estate sector ) or ( state sector )))).
• Adding a wildcard symbol may retrieve word variants: (((("state action") or ("state actors"))) or ((("estate sector") or ("state sector"))))*.