Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passieren, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passiver, passieren
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massivere » massiveere, 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 massiv) OR ((passiveren OR passiverer) OR massivere)) OR (massivere OR passivieren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or massiv) or ((passiveren OR passiverer) or massivere)) or (massivere or passivieren))".
• Adding a wildcard symbol may retrieve word variants: (((passiv or massiv) or ((passiveren OR passiverer) or massivere)) or (massivere or passivieren))*.