Perhaps you should try some spelling variations:
"et cooperations history" » "et cooperation history", "et corporations history", "et operaciones history", "et cooperatives history", "eu cooperation history"
"mass communication iran" » "mass communication iraq", "mass communication ireland", "mass communication brands", "maps communication iran"
"nets community issues" » "needs community issues", "tents community issues", "arts community issues"

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: (((("mass communication iran") OR ("nets community issues"))) OR ("et cooperations history"))~.
• Removing quotes may allow a broader search: (((( mass communication iran ) or ( nets community issues ))) or ( et cooperations history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("mass communication iran") or ("nets community issues"))) or ("et cooperations history"))*.