Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierende » passiveierende, massivierende, passivenierende, passivierender, passivieren, aktivierende
passiverer » passiveerer, massiverer, passivenerer, passiverwerb, passivieren, passiver
massivieren » passivieren, massigeren, passivierung
massiverer » massierer, massiver, massigeren, massiverr, massivelyr
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 (passivierende OR massivieren)) OR ((passiverer OR massiverer) OR massivere)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passivierende or massivieren)) or ((passiverer OR massiverer) or massivere))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passivierende or massivieren)) or ((passiverer OR massiverer) or massivere))*.