Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveeren » passiveeeren, massiveeren, passiveneeren, passieren, passiverer, passivierende
passivere » passiveere, massivere, passivenere, passiverer, passiver, passiviert
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massivieren » massigeren, passivierende, passivierung
massivere » massiver, massive, massively

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