Perhaps you should try some spelling variations:
"re decolonization case" » "re decolonization across", "re decolonization notes", "re decolonization _", "_ decolonization case", "re colonization case", "box decolonization case"
"_ colonization failed" » "_ colonization still", "_ organizations failed", "_ decolonization failed", "decolonization _ failed"
"re cooperation history" » "re corporation history", "re federation history", "de cooperation history", "area cooperation history", "rate 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: (((("re decolonization case") OR ("_ colonization failed"))) OR ("re cooperation history"))~.
• Removing quotes may allow a broader search: (((( re decolonization case ) or ( _ colonization failed ))) or ( re cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization case") or ("_ colonization failed"))) or ("re cooperation history"))*.