Perhaps you should try some spelling variations:
"re cooperation history" » "re corporation history", "re federation history", "de cooperation history", "area cooperation history", "rate cooperation history"
"mars colonization songs" » "mars colonization still", "mars colonization work", "mars decolonization notes", "mrsa colonization songs", "its colonization songs", "jews colonization songs"
"mass communication iraq" » "mass communication iran", "mass communication israel", "mass communication italy", "maps communication iraq"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("mars colonization songs") or ((("re cooperation history") or ("mass communication iraq"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mars colonization songs") OR ((("re cooperation history") OR ("mass communication iraq"))))*.
• Removing quotes may allow a broader search: (( mars colonization songs ) or ((( re cooperation history ) or ( mass communication iraq ))))*.