Perhaps you should try some spelling variations:
"its cooperation history" » "its corporation history", "its federation history", "et 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"
"city cooperation still" » "city cooperation scale", "city cooperation state", "city cooperation studies", "city corporation still", "china cooperation still", "city corporations still"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("city cooperation still") OR ("its colonization songs"))) OR ("its cooperation history"))~.
• Removing quotes may allow a broader search: (((( city cooperation still ) or ( its colonization songs ))) or ( its cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("city cooperation still") or ("its colonization songs"))) or ("its cooperation history"))*.