Perhaps you should try some spelling variations:
passiv » passiven, passiver
passivieren » passivenieren, passiverieren, passivierende, passivierung, passieren
passivereren » passivenereren, passiverereren, passiverer, passivierenden, passieren
passive » passivene, passivere
massiv » massive

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: (((passiv OR massiv) OR (passivieren OR passivereren)) OR passive).
• Adding a wildcard symbol may retrieve word variants: (((passiv or massiv) or (passivieren or passivereren)) or passive)*.