Perhaps you should try some spelling variations:
employee » employed
employees » employeds
co-operatives" » co-operativen", co-cooperatives", co-imperatives", co-operations", co-operatings"
co-cooperativen" » co-cooperative", co-cooperatives", co-kooperativen", co-cocooperativen", co-cooperationn", co-cooperatingn"
co-operative" » co-cooperative", co-operation", co-operating"

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