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