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