Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivierung » massivierung, passivenierung, passiverierung, aktivierung
passivener » massivener, passivenener, passiverener, passiverer, passiven, passiver

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