Perhaps you should try some spelling variations:
"_ decolonization africa" » "_ democratization africa", "decolonization _ africa"
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "et cooperation studies", "its corporation studies"
"re colonization work" » "re colonization's mark", "re colonization songs", "re colonization _", "pro colonization work", "_ colonization work", "jews colonization 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: (((("its cooperation studies") OR ("re colonization work"))) OR ("_ decolonization africa"))~.
• Removing quotes may allow a broader search: (((( its cooperation studies ) or ( re colonization work ))) or ( _ decolonization africa ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its cooperation studies") or ("re colonization work"))) or ("_ decolonization africa"))*.