Perhaps you should try some spelling variations:
state reactions » state relations
state actions » state action, state actors, state functions
state sector » estate sector, state vectors, state section
state actor » state actors, state action, state after

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