Perhaps you should try some spelling variations:
"middle earth / history" » "middle east / history", "middle ears / history", "middle part / history", "middle eastth / history"
"middle class / history" » "middle east / history"
"middle last / history" » "middle east / history", "middle late / history", "middle east's / history"
"middle ear / history" » "middle east / history"

Try widening your search to All Fields.

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 / history") OR ((("middle earth / history") OR ("middle ear / history"))))) OR ("middle class / history")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"middle last / history\") or (((\"middle earth / history\") OR (\"middle ear / history\"))))) or (\"middle class / history\"))".
• Removing quotes may allow a broader search: (((( middle last / history ) or ((( middle earth / history ) OR ( middle ear / history ))))) or ( middle class / history )).
• Adding a wildcard symbol may retrieve word variants: (((("middle last / history") or ((("middle earth / history") OR ("middle ear / history"))))) or ("middle class / history"))*.