Perhaps you should try some spelling variations:
employee » employed
employees » employeds
co-operatings" » co-operating", co-operationes", co-operaticas"
co-operativen" » co-operative", co-operation"
co-cooperative" » co-cooperation"

Try widening your search to All Fields.

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: (("(employee or employees)-ownership & (co-operatings" OR (co-operativen" or co-cooperative"))) OR ("(employee or employees)-ownership & co-operations")).
• Removing quotes may allow a broader search: (( (employee or employees)-ownership & (co-operatings or (co-operativen or co-cooperative ))) or ( (employee or employees)-ownership & co-operations )).
• Adding a wildcard symbol may retrieve word variants: (("(employee or employees)-ownership & (co-operatings" or (co-operativen" or co-cooperative"))) or ("(employee or employees)-ownership & co-operations"))*.