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