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