Perhaps you should try some spelling variations:
employee » employees, employed
employeds » employees, employed, employers
co-operative" » co-cooperative", co-operating"
co-operativen" » co-cooperativen", co-operatingn"

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