Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passagieren
passivereren » passiveereren, massivereren, passiverereren, passiverer, passivierenden, passiverwerb
passiven » passiveen, massiven, passiveren, passive, passion
passieren » 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: ((passiv OR ((passivieren OR passieren) OR passivereren)) OR passiven).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or ((passivieren OR passieren) or passivereren)) or passiven)".
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passivieren OR passieren) or passivereren)) or passiven)*.