Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveand » passiveeand, passiveneand, passivereand, passiven
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passagieren
massiv » massive
passieren » passiert, passiven

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