Perhaps you should try some spelling variations:
"_ decolonization failed" » "_ colonization failed", "_ decolonization case", "_ decolonization africa", "decolonization _ failed"
"its cooperation sources" » "its cooperation series", "its cooperation studies", "its cooperation countries", "city cooperation sources", "et cooperation sources", "its corporation sources"
"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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"its cooperation sources\") OR (\"re colonization work\"))) OR (\"_ decolonization failed\"))~".
• Removing quotes may allow a broader search: (((( its cooperation sources ) OR ( re colonization work ))) OR ( _ decolonization failed ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its cooperation sources") OR ("re colonization work"))) OR ("_ decolonization failed"))*.