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

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