Perhaps you should try some spelling variations:
"c's communication issues" » "c's community issues", "c's communication india", "c's communication united", "lea's communication issues", "class communication issues", "les communications issues"
"mass communication iraq" » "mass communication iran", "mass communication israel", "mass communication italy", "maps communication iraq"
"mars colonization songs" » "mars colonization still", "mars colonization work", "mars decolonization notes", "mrsa colonization songs", "its colonization songs", "jews colonization songs"

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: (((("c's communication issues") OR ("mass communication iraq"))) OR ("mars colonization songs"))~.
• Removing quotes may allow a broader search: (((( c's communication issues ) or ( mass communication iraq ))) or ( mars colonization songs ))~.
• Adding a wildcard symbol may retrieve word variants: (((("c's communication issues") or ("mass communication iraq"))) or ("mars colonization songs"))*.