Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivere » massivere, passivenere, passiverere, passiverer, passiver
passivieren » massivieren, passivenieren, passiverieren, passivierende, passivierung, passieren

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