Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passivieren, passieren, passiverer, passiverern, passivern, passivierenn
passivere » passiveere, massivere, passiverere, passiverer, passiver, passivieren
massivere » 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 (passiven OR passiveren)) OR (passivere OR massivere)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passiven or passiveren)) or (passivere OR massivere))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiven or passiveren)) or (passivere OR massivere))*.