Perhaps you should try some spelling variations:
"u.s communication series" » "u.s communication services", "u.s communication systems", "u.s communication skills", "u.s communications series", "2.3 communication series", "3.2 communication series"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"nets communication iraq" » "lea's communication iraq", "mass communication iraq", "c's communication iraq", "nets communication iran", "nets communication israel", "nets communication italy"

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