Perhaps you should try some spelling variations:
passively » massively, passivity, passiven
passivieren » passivierung, passagieren, passivierender
passivierende » passivierungde, passagierende, passivierenderde, passivierender, aktivierende, passivierung
passieren » passiert, passiven

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: (passively OR (((passivieren OR passieren) OR passivierende) OR passive)).
• Adding a wildcard symbol may retrieve word variants: (passively or (((passivieren or passieren) or passivierende) or passive))*.