Perhaps you should try some spelling variations:
passivieren » passivierung, passieren, passagieren
passivierende » passivierungde, passierende, passagierende, passivierender, aktivierende, passivierung
passierende » passerende, grassierende, haussierende

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