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 state", "pro cooperation studies", "group cooperation still", "area cooperation still", "arab cooperation still"
"mars operation state" » "mars operations state", "mars operation stage", "mars cooperation state", "market operation state", "early operation state", "gas operations state"

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