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", co-operation"

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) OR employeds)-ownership & (co-operatives" or co-operativen")) OR ("((employee OR employees) or employeds)-ownership & co-operations")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"((employee OR employees) or employeds)-ownership & (co-operatives\" or co-operativen\")) or (\"((employee OR employees) or employeds)-ownership & co-operations\"))".
• Removing quotes may allow a broader search: (( ((employee OR employees) or employeds)-ownership & (co-operatives or co-operativen )) or ( ((employee OR employees) or employeds)-ownership & co-operations )).
• Adding a wildcard symbol may retrieve word variants: (("((employee OR employees) or employeds)-ownership & (co-operatives" or co-operativen")) or ("((employee OR employees) or employeds)-ownership & co-operations"))*.