Perhaps you should try some spelling variations:
"class communication united" » "class telecommunication united", "mass communication united", "plans communication united", "crisis communication united"
"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: (("class communication united") or ((("jews colonization still") or ("city cooperation studies"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("class communication united") OR ((("jews colonization still") OR ("city cooperation studies")))).
• Removing quotes may allow a broader search: (( class communication united ) or ((( jews colonization still ) or ( city cooperation studies )))).
• Adding a wildcard symbol may retrieve word variants: (("class communication united") or ((("jews colonization still") or ("city cooperation studies"))))*.