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"
"jews colonization failed" » "jews colonization still", "jews organizations failed", "its colonization failed", "mars colonization failed", "re colonization failed"
"city cooperation studies" » "city cooperation series", "city cooperation sources", "city cooperation implies", "city corporation studies", "china cooperation studies", "city corporations studies"

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