Perhaps you should try some spelling variations:
co-operatives" » co-cooperatives", co-imperatives", co-operations", co-operatings"
co-operativen" » co-operation", co-cooperativen", co-operationn", co-operatingn"
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 employed) or employees)-ownership & (co-operatives" OR (co-operativen" or co-operative"))) OR ("((employee OR employed) or employees)-ownership & co-operations")).
• Removing quotes may allow a broader search: (( ((employee OR employed) or employees)-ownership & (co-operatives or (co-operativen or co-operative ))) or ( ((employee OR employed) or employees)-ownership & co-operations )).
• Adding a wildcard symbol may retrieve word variants: (("((employee OR employed) or employees)-ownership & (co-operatives" or (co-operativen" or co-operative"))) or ("((employee OR employed) or employees)-ownership & co-operations"))*.