Perhaps you should try some spelling variations:
"state actions" » "state reactions", "state actors", "state functions", "state reactionss", "state actorss"
"state sector" » "estate sector", "state vectors", "state section"
"state vector" » "space vector"
"state action" » "state reactions", "state actors"

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