Perhaps you should try some spelling variations:
"history / middle class / general" » "history / middle east / general"
"history / middle last / general" » "history / middle east / general", "history / middle late / general", "history / middle east's / general"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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