Perhaps you should try some spelling variations:
"early cooperative studies" » "early comparative studies", "early cooperation studies", "early cooperative strategies", "early postoperative studies", "dairy cooperative studies"
"its colonization israel" » "its communication israel", "its colonization still", "its colonization history", "anti colonization israel", "jews colonization israel", "mars colonization israel"
"de community issues" » "der community issues", "des community issues", "ode community issues"

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: (("de community issues") OR ((("early cooperative studies") OR ("its colonization israel"))))~.
• Removing quotes may allow a broader search: (( de community issues ) or ((( early cooperative studies ) or ( its colonization israel ))))~.
• Adding a wildcard symbol may retrieve word variants: (("de community issues") or ((("early cooperative studies") or ("its colonization israel"))))*.