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

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