Perhaps you should try some spelling variations:
"_ decolonization failed" » "_ colonization failed", "_ decolonization case", "_ decolonization africa", "decolonization _ failed"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"its colonization songs" » "its colonization still", "its colonization work", "its decolonization notes", "anti colonization songs", "jews colonization songs", "mars colonization songs"

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