Perhaps you should try some spelling variations:
"its colonization's mark" » "its colonization work"
"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"

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