Perhaps you should try some spelling variations:
"_ decolonization case" » "_ decolonization across", "_ decolonization notes", "_ decolonization _", "decolonization _ case"
"et cooperation sources" » "et cooperation series", "et cooperation studies", "et cooperation countries", "et cooperations sources", "eu cooperation sources", "2 cooperation 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("et cooperation sources") or ("re colonization work"))) or ("_ decolonization case"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("et cooperation sources") OR ("re colonization work"))) OR ("_ decolonization case")).
• Removing quotes may allow a broader search: (((( et cooperation sources ) or ( re colonization work ))) or ( _ decolonization case )).
• Adding a wildcard symbol may retrieve word variants: (((("et cooperation sources") or ("re colonization work"))) or ("_ decolonization case"))*.