Perhaps you should try some spelling variations:
"its decolonization case" » "its decolonization across", "its decolonization notes", "its decolonization _", "its colonization case", "_ decolonization case", "box decolonization case"
"_ colonization failed" » "_ colonization still", "_ organizations failed", "_ decolonization failed", "decolonization _ failed"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"

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