Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passagieren
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passiver, massivere
passiven » passiveen, massiven, passiveren, passive, passion
passieren » passiert
passagerer » passagere, passageren, passagieren

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 (passiverer OR passagerer)))) OR passiven).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passivieren or (passieren or (passiverer OR passagerer)))) or passiven)".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passivieren or (passieren or (passiverer OR passagerer)))) or passiven)*.