Perhaps you should try some spelling variations:
"mass communication issues" » "mass community issues", "mass communication india", "mass communication united", "maps communication issues"
"city cooperation implies" » "city cooperation series", "city cooperation studies", "city cooperation civility", "city corporation implies", "china cooperation implies", "city corporations implies"
"pro colonization still" » "pro colonization failed", "pro colonization israel", "pro colonization songs", "bio colonization still", "re colonization still", "mars 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 ((("pro colonization still") or ("city cooperation implies"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mass communication issues") OR ((("pro colonization still") OR ("city cooperation implies")))).
• Removing quotes may allow a broader search: (( mass communication issues ) or ((( pro colonization still ) or ( city cooperation implies )))).
• Adding a wildcard symbol may retrieve word variants: (("mass communication issues") or ((("pro colonization still") or ("city cooperation implies"))))*.