Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivereren » passiveereren, massivereren, passiverereren, passivieren, passiverer, passivierenden
passiven » passiveen, massiven, passiveren, passive, passion
massivieren » passivieren, massivere, massigeren

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 (massivieren OR passivereren)) OR passiven).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massivieren or passivereren)) or passiven)*.