Perhaps you should try some spelling variations:
"its colonization failed" » "its colonization still", "its organizations failed", "anti colonization failed", "jews colonization failed", "mars colonization failed"
"et cooperation history" » "et corporation history", "et federation history", "et cooperations history", "eu cooperation history", "2 cooperation history"
"_ colonization songs" » "_ colonization still", "_ colonization work", "_ decolonization notes"

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