Perhaps you should try some spelling variations:
"state vectors" » "state detectors"
"state section" » "states section", "state reaction", "state action"
"state sector" » "estate sector", "state sensor", "states section"
"state actor" » "state action", "state after", "state actions"
"state actors" » "state actions", "state afters", "state actionss", "state factors"
"state acts" » "state tracts", "late acts", "state action"

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 acts"))) OR ((((((("state sector") OR ("state section"))) OR ("state vectors"))) OR ("state vector"))))) OR ("state actors"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"state actor\") or (\"state acts\"))) or (((((((\"state sector\") OR (\"state section\"))) or (\"state vectors\"))) or (\"state vector\"))))) or (\"state actors\"))*".
• Removing quotes may allow a broader search: (((((( state actor ) or ( state acts ))) or ((((((( state sector ) OR ( state section ))) or ( state vectors ))) or ( state vector ))))) or ( state actors ))*.