Perhaps you should try some spelling variations:
"et cooperation studies" » "et cooperation series", "et cooperation sources", "et cooperation implies", "et cooperations studies", "eu cooperation studies", "2 cooperation studies"
"_ colonization still" » "_ colonization failed", "_ colonization israel", "_ cooperation still"
"its colonization songs" » "its colonization work", "its decolonization notes", "anti colonization songs", "jews colonization songs", "mars colonization songs"

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