Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivere » passiveere, massivere, passivenere, passiverer, passiver
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passagieren
passieren » passiert, passiven

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