Perhaps you should try some spelling variations:
"mars cooperation studies" » "mars cooperation series", "mars cooperation sources", "mars cooperation implies", "early cooperation studies", "area cooperation studies", "arab cooperation studies"
"its colonization israel" » "its communication israel", "its colonization history", "its decolonization islam", "anti colonization israel", "jews colonization israel", "mars colonization israel"
"mrsa colonization still" » "mrsa colonization failed", "mrsa colonization songs", "mrsa cooperation still", "mars colonization still", "coca colonization still", "pro colonization still"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("its colonization israel") or ((("mrsa colonization still") or ("mars cooperation studies"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("its colonization israel") OR ((("mrsa colonization still") OR ("mars cooperation studies")))).
• Removing quotes may allow a broader search: (( its colonization israel ) or ((( mrsa colonization still ) or ( mars cooperation studies )))).
• Adding a wildcard symbol may retrieve word variants: (("its colonization israel") or ((("mrsa colonization still") or ("mars cooperation studies"))))*.