Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenierende » passiveenierende, massivenierende, passivenenierende, passivierende, passivierender, passivierenden
massigen » massiger, massige, massigung
massiveeren » massivere, passivieren, massigeren

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 (passivenierende OR (massigen OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or (passivenierende or (massigen or massiveeren)))*.