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

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: (( operatives marketing ) OR ( kooperatives marketing ))*.