Perhaps you should try some spelling variations:
"jews cooperation studies" » "jews cooperation series", "jews cooperation sources", "jews cooperation implies", "de cooperation studies", "eu cooperation studies", "peer cooperation studies"
"jews colonization songs" » "jews colonization still", "jews colonization work", "jews decolonization notes", "its colonization songs", "mars colonization songs", "re colonization songs"
"et cooperation scale" » "et cooperation case", "et cooperation state", "et cooperation sara", "et cooperations scale", "eu cooperation scale", "2 cooperation scale"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("jews cooperation studies") or ("et cooperation scale"))) or ("jews colonization songs"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("jews cooperation studies") OR ("et cooperation scale"))) OR ("jews colonization songs")).
• Removing quotes may allow a broader search: (((( jews cooperation studies ) or ( et cooperation scale ))) or ( jews colonization songs )).
• Adding a wildcard symbol may retrieve word variants: (((("jews cooperation studies") or ("et cooperation scale"))) or ("jews colonization songs"))*.