Perhaps you should try some spelling variations:
passiv » passiven, passiver
passive » passivene, passivere
passivieren » 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 passive) OR passivieren) OR massiv) OR massivere).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv OR passive) or passivieren) or massiv) or massivere)".
• Adding a wildcard symbol may retrieve word variants: ((((passiv OR passive) or passivieren) or massiv) or massivere)*.