Perhaps you should try some spelling variations:
private partnerschaft » private partnerschaften, private partnership, die partnerschaft
private partnering » private bartering, private partner, private partnership
private partners » private parties, private partnership, private learners
partnerships » partnership

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: public ((((((private partnerschaft) OR (private partnering))) OR (private partners))) OR (private partnerships)).
• Adding a wildcard symbol may retrieve word variants: public ((((((private partnerschaft) or (private partnering))) or (private partners))) or (private partnerships))*.