Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierung » passiveierung, massivierung, passivenierung, aktivierung
passiverer » passiveerer, massiverer, passivenerer, passiverwerb, passivieren, passiver, passiverr, passivierenr
passivere » passiveere, massivere, passivenere, passiver, passivieren

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 (passivierung OR passiverer)) OR passivere).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passivierung or passiverer)) or passivere)*.