Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiveren » passiveeren, massiveren, passivereren, passivieren, passieren, passiverer
passivereren » passiveereren, massivereren, passiverereren, passivieren, passiverer, passivierenden
passiven » passiveen, massiven, passiveren, passive, passion

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