Perhaps you should try some spelling variations:
"jews cooperation studies" » "jews cooperation series", "jews cooperation sources", "jews cooperation implies", "de cooperation studies", "et cooperation studies", "eu cooperation studies"
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations history"
"its colonization _" » "anti colonization _", "jews colonization _", "mars colonization _"

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