Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiveren » massiveren, passiveneren, passivereren, passieren, passiverer, passiven
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 (passiveren OR (passivieren OR massivieren))) OR passive).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passiveren or (passivieren OR massivieren))) or passive)".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiveren or (passivieren OR massivieren))) or passive)*.