Perhaps you should try some spelling variations:
employee » employed
employees » employeds
employeds » employed, employers, employes
co-operatives" » co-operative", co-cooperatives", co-imperatives"
co-operativen" » co-operative"

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