Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "_ decolonization africa", "re colonization africa", "box decolonization africa"
"_ 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("re decolonization africa") or ("_ colonization failed"))) or ("re cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("re decolonization africa") OR ("_ colonization failed"))) OR ("re cooperation history"))*.
• Removing quotes may allow a broader search: (((( re decolonization africa ) or ( _ colonization failed ))) or ( re cooperation history ))*.