Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passieren, passiver, passageren
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passiver, passieren
massively » massive

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