Perhaps you should try some spelling variations:
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "its operation history"
"its colonization songs" » "its colonization still", "its colonization work", "its decolonization notes", "anti colonization songs", "jews colonization songs", "mars colonization songs"
"et cooperation series" » "et cooperation theories", "et cooperation sources", "et cooperation studies", "et cooperations series", "eu cooperation series", "2 cooperation series"

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