Perhaps you should try some spelling variations:
"state actions" » "state action", "state reactions", "state functions"
"state sector" » "estate sector", "state vectors", "state section"
"state vector" » "space vector"
"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 after") OR ("state actors"))) OR ((("state sector") OR ("state vector"))))) OR ("state actions")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"state after\") OR (\"state actors\"))) or (((\"state sector\") or (\"state vector\"))))) or (\"state actions\"))".
• Removing quotes may allow a broader search: (((((( state after ) OR ( state actors ))) or ((( state sector ) or ( state vector ))))) or ( state actions )).
• Adding a wildcard symbol may retrieve word variants: (((((("state after") OR ("state actors"))) or ((("state sector") or ("state vector"))))) or ("state actions"))*.