Perhaps you should try some spelling variations:
"u.s communications series" » "u.s communication series", "u.s communications services", "u.s communication services", "3.1 communications series", "les communications series", "nps communications series"
"lea's communication iraq" » "mass communication iraq", "crisis communication iraq", "leadership communication iraq", "lea's communication iran", "lea's communication israel", "lea's communication italy"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"

Try widening your search to All Fields.

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 series") or ("lea's communication iraq"))) or ("its cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("u.s communications series") OR ("lea's communication iraq"))) OR ("its cooperation history")).
• Removing quotes may allow a broader search: (((( u.s communications series ) or ( lea's communication iraq ))) or ( its cooperation history )).
• Adding a wildcard symbol may retrieve word variants: (((("u.s communications series") or ("lea's communication iraq"))) or ("its cooperation history"))*.