Perhaps you should try some spelling variations:
"kooperatives marketing" » "operatives marketing", "cooperative marketing", "operativen marketing"
"cooperatives marketing" » "cooperative marketing", "operatives marketing", "kooperative marketing"

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: (("kooperatives marketing") OR ("cooperatives marketing"))*.
• Removing quotes may allow a broader search: (( kooperatives marketing ) or ( cooperatives marketing ))*.