Perhaps you should try some spelling variations:
passiven » passive, passion
passivieren » passivierung, passieren, passivierender
passivierende » passivierungde, passierende, passivierenderde, passivierender, aktivierende, passivierung
passagieren » passagiere, passieren

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