Perhaps you should try some spelling variations:
"trade cooperation still" » "border cooperation still", "trade cooperation scale", "trade cooperation state", "trade cooperation studies"
"its colonization case" » "its decolonization case", "its colonization failed", "its communication case", "anti colonization case", "jews colonization case", "mars colonization case"
"re colonization _" » "pro colonization _", "_ colonization _", "jews colonization _"

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: (("trade cooperation still") OR ((("re colonization _") OR ("its colonization case"))))~.
• Removing quotes may allow a broader search: (( trade cooperation still ) or ((( re colonization _ ) or ( its colonization case ))))~.
• Adding a wildcard symbol may retrieve word variants: (("trade cooperation still") or ((("re colonization _") or ("its colonization case"))))*.