Perhaps you should try some spelling variations:
"middle state" » "middle states", "middle stone", "middle age"
"middle layer" » "middle ages", "middle aged", "middle age"
"middle last" » "middle east", "middle class", "middle late"

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: (("middle last") OR ((("middle layer") OR ("middle state")))).
• Removing quotes may allow a broader search: (( middle last ) or ((( middle layer ) or ( middle state )))).
• Adding a wildcard symbol may retrieve word variants: (("middle last") or ((("middle layer") or ("middle state"))))*.