Perhaps you should try some spelling variations:
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "et cooperation studies", "its corporation studies"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"its colonization work" » "its colonization's mark", "its colonization songs", "its colonization _", "anti colonization work", "jews colonization work", "mars colonization work"

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 work") or ("its cooperation studies"))) or ("its cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("its colonization work") OR ("its cooperation studies"))) OR ("its cooperation history"))*.
• Removing quotes may allow a broader search: (((( its colonization work ) or ( its cooperation studies ))) or ( its cooperation history ))*.