Perhaps you should try some spelling variations:
"_ decolonization failed" » "_ colonization failed", "_ decolonization case", "_ decolonization africa", "decolonization _ failed"
"its decolonisation from" » "its decolonization from", "its decolonisation _", "its decolonisation 1", "_ decolonisation from", "4.4 decolonisation from", "its colonization from"
"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 decolonisation from") OR ("_ decolonization failed"))) OR ("its cooperation history"))~.
• Removing quotes may allow a broader search: (((( its decolonisation from ) or ( _ decolonization failed ))) or ( its cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its decolonisation from") or ("_ decolonization failed"))) or ("its cooperation history"))*.