Perhaps you should try some spelling variations:
"mass communication issues" » "mass community issues", "mass communication india", "mass communication united", "maps communication issues"
"city cooperation studies" » "city cooperation series", "city cooperation sources", "city cooperation implies", "city corporation studies", "china cooperation studies", "city corporations studies"
"jews colonization still" » "jews colonization failed", "jews colonization israel", "jews colonization songs", "its colonization still", "mars colonization still", "re colonization still"

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: (("mass communication issues") or ((("jews colonization still") or ("city cooperation studies"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mass communication issues") OR ((("jews colonization still") OR ("city cooperation studies")))).
• Removing quotes may allow a broader search: (( mass communication issues ) or ((( jews colonization still ) or ( city cooperation studies )))).
• Adding a wildcard symbol may retrieve word variants: (("mass communication issues") or ((("jews colonization still") or ("city cooperation studies"))))*.