Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "_ decolonization africa", "box decolonization africa", "war decolonization africa"
"re colonization history" » "re communication history", "re organization history", "re cooperation history", "pro colonization history", "_ colonization history", "jews colonization history"
"_ decolonisation 1" » "_ decolonization 1", "_ decarbonization 1", "_ decolonisation _", "_ decolonisations _", "_ decolonization _"

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 africa") OR ("_ decolonisation 1"))) OR ("re colonization history"))~.
• Removing quotes may allow a broader search: (((( re decolonization africa ) or ( _ decolonisation 1 ))) or ( re colonization history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization africa") or ("_ decolonisation 1"))) or ("re colonization history"))*.