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