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 work" » "pro colonization's mark", "pro colonization songs", "pro colonization _", "bio colonization work", "re colonization work", "mars colonization work"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("its cooperation studies") OR ("pro colonization work"))) OR ("_ decolonization failed"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"its cooperation studies\") OR (\"pro colonization work\"))) OR (\"_ decolonization failed\"))*".
• Removing quotes may allow a broader search: (((( its cooperation studies ) OR ( pro colonization work ))) OR ( _ decolonization failed ))*.