Perhaps you should try some spelling variations:
"u.s communications issues" » "u.s communication issues", "u.s communications studies", "u.s communications costs", "3.1 communications issues", "les communications issues", "nps communications issues"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"nets communication iran" » "lea's communication iran", "mass communication iran", "c's communication iran", "nets communication iraq", "nets communication ireland", "nets communication brands"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("u.s communications issues") or ("nets communication iran"))) or ("its cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("u.s communications issues") OR ("nets communication iran"))) OR ("its cooperation history"))*.
• Removing quotes may allow a broader search: (((( u.s communications issues ) or ( nets communication iran ))) or ( its cooperation history ))*.