Perhaps you should try some spelling variations:
"class communication israel" » "class communication issues", "class communication iran", "class communication iraq", "mass communication israel", "plans communication israel", "crisis communication israel"
"city cooperation studies" » "city cooperation series", "city cooperation sources", "city cooperation implies", "city corporation studies", "china cooperation studies", "city corporations studies"
"jews colonization songs" » "jews colonization still", "jews colonization work", "jews decolonization notes", "its colonization songs", "mars colonization songs", "re colonization songs"

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