Perhaps you should try some spelling variations:
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "its corporation studies", "its operation studies"
"et cooperation history" » "et corporation history", "et federation history", "et cooperations history", "eu cooperation history", "2 cooperation history"
"its colonization still" » "its colonization failed", "its colonization israel", "its colonization songs", "anti colonization still", "jews colonization still", "mars 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 still") or ("its cooperation studies"))) or ("et cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("its colonization still") OR ("its cooperation studies"))) OR ("et cooperation history"))*.
• Removing quotes may allow a broader search: (((( its colonization still ) or ( its cooperation studies ))) or ( et cooperation history ))*.