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

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