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"
"nets communication iran" » "lea's communication iran", "mass communication iran", "c's communication iran", "nets communication iraq", "nets communication ireland", "nets communication brands"
"city federation history" » "city migration history", "city regeneration history", "asian federation history", "city 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 ("nets communication iran"))) or ("city federation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("u.s communications series") OR ("nets communication iran"))) OR ("city federation history")).
• Removing quotes may allow a broader search: (((( u.s communications series ) or ( nets communication iran ))) or ( city federation history )).
• Adding a wildcard symbol may retrieve word variants: (((("u.s communications series") or ("nets communication iran"))) or ("city federation history"))*.