Perhaps you should try some spelling variations:
"u.s communication issues" » "u.s community issues", "u.s communication india", "u.s communication united", "u.s communications issues", "2.3 communication issues", "3.2 communication issues"
"nets communication israel" » "nets communication iran", "nets communication iraq", "nets telecommunication israel", "lea's communication israel", "mass communication israel", "c's communication israel"
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations 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 communication issues") or ("nets communication israel"))) or ("city cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("u.s communication issues") OR ("nets communication israel"))) OR ("city cooperation history")).
• Removing quotes may allow a broader search: (((( u.s communication issues ) or ( nets communication israel ))) or ( city cooperation history )).
• Adding a wildcard symbol may retrieve word variants: (((("u.s communication issues") or ("nets communication israel"))) or ("city cooperation history"))*.