Perhaps you should try some spelling variations:
"mass communication issues" » "mass community issues", "mass communication india", "mass communication united", "maps communication issues"
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations history"
"nets communication iraq" » "lea's communication iraq", "c's communication iraq", "les communications iraq", "nets communication iran", "nets communication israel", "nets communication italy"

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: (((("mass communication issues") OR ("nets communication iraq"))) OR ("city cooperation history"))~.
• Removing quotes may allow a broader search: (((( mass communication issues ) or ( nets communication iraq ))) or ( city cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("mass communication issues") or ("nets communication iraq"))) or ("city cooperation history"))*.