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"
"c's communication israel" » "c's communication iran", "c's communication iraq", "c's telecommunication israel", "lea's communication israel", "class communication israel", "mass communication israel"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"

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

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