Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passivieren » passiveieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massiven » massiveen, massive
massively » massiveely, massive
massivieren » massiveieren, 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 massiv) OR passiven) OR ((massiven OR massively) OR (passivieren OR massivieren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR massiv) or passiven) or ((massiven or massively) or (passivieren or massivieren)))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR massiv) or passiven) or ((massiven or massively) or (passivieren or massivieren)))*.