Perhaps you should try some spelling variations:
"_ decolonization failed" » "_ colonization failed", "_ decolonization case", "_ decolonization africa", "decolonization _ failed"
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "et cooperation studies", "its corporation studies"
"pro colonization's mark" » "pro colonization work", "bio colonization mark", "re colonization mark"

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 ("pro colonization's mark"))) OR ("_ decolonization failed"))~.
• Removing quotes may allow a broader search: (((( its cooperation studies ) or ( pro colonization's mark ))) or ( _ decolonization failed ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its cooperation studies") or ("pro colonization's mark"))) or ("_ decolonization failed"))*.