Perhaps you should try some spelling variations:
passiven » passive, passion
passione » passion, passions, passionate
passiverer » passiverwerb, passivieren, passagerer, passiveer, passivelyer, passierter
passieren » passiert
passiver » passive, passively, passiert

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: (passiven OR (((passione OR (passiverer OR passieren)) OR passiver) OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiven or (((passione or (passiverer OR passieren)) or passiver) or passiveand))".
• Adding a wildcard symbol may retrieve word variants: (passiven or (((passione or (passiverer OR passieren)) or passiver) or passiveand))*.