Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivieren » massivieren, passivenieren, passiverieren, passivierende, passieren, passagieren
passivierung » massivierung, passivenierung, passiverierung, aktivierung

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