Perhaps you should try some spelling variations:
"et cooperation history" » "et corporation history", "et federation history", "et cooperations history", "eu cooperation history", "2 cooperation history"
"its communication iran" » "its communication iraq", "its communication ireland", "its communication brands", "nets communication iran", "c's communication iran", "mass 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("its communication iran") OR ("nets community issues"))) OR ("et cooperation history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"its communication iran\") OR (\"nets community issues\"))) OR (\"et cooperation history\"))".
• Removing quotes may allow a broader search: (((( its communication iran ) OR ( nets community issues ))) OR ( et cooperation history )).
• Adding a wildcard symbol may retrieve word variants: (((("its communication iran") OR ("nets community issues"))) OR ("et cooperation history"))*.