Perhaps you should try some spelling variations:
"_ colonization failed" » "_ colonization still", "_ organizations failed", "_ decolonization failed", "decolonization _ failed"
"pro colonization songs" » "pro colonization still", "pro colonization work", "pro decolonization notes", "bio colonization songs", "re colonization songs", "mars colonization songs"
"city cooperation still" » "city cooperation scale", "city cooperation state", "city cooperation studies", "city corporation still", "china cooperation still", "city corporations still"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("city cooperation still") or ("pro colonization songs"))) or ("_ colonization failed"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("city cooperation still") OR ("pro colonization songs"))) OR ("_ colonization failed"))*.
• Removing quotes may allow a broader search: (((( city cooperation still ) or ( pro colonization songs ))) or ( _ colonization failed ))*.