Perhaps you should try some spelling variations:
"_ colonization failed" » "_ colonization still", "_ organizations failed", "_ decolonization failed", "decolonization _ failed"
"pro cooperation still" » "pro cooperation scale", "pro cooperation studies", "pro cooperation series", "group cooperation still", "area cooperation still", "arab cooperation still"
"mars cooperation state" » "mars cooperation scale", "mars operation state", "mars cooperation strategy", "early cooperation state", "area cooperation state", "arab cooperation state"

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: (("pro cooperation still") OR ((("mars cooperation state") OR ("_ colonization failed"))))~.
• Removing quotes may allow a broader search: (( pro cooperation still ) or ((( mars cooperation state ) or ( _ colonization failed ))))~.
• Adding a wildcard symbol may retrieve word variants: (("pro cooperation still") or ((("mars cooperation state") or ("_ colonization failed"))))*.