Perhaps you should try some spelling variations:
"_ decolonization models" » "_ decolonization notes", "_ decolonization across", "_ decolonization case", "decolonization _ models"
"its colonization failed" » "its colonization still", "its organizations failed", "anti colonization failed", "jews colonization failed", "mars colonization failed"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"

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: (((("its colonization failed") OR ("_ decolonization models"))) OR ("its cooperation history"))~.
• Removing quotes may allow a broader search: (((( its colonization failed ) or ( _ decolonization models ))) or ( its cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its colonization failed") or ("_ decolonization models"))) or ("its cooperation history"))*.