Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiverity » massiverity, passivererity, passivity
passiven » massiven, passiveren, passion
passive » massive, passivere
massivene » massiven, massive, massively
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 ((passiverity OR passiven) OR passive)) OR (massivene OR massivere)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passiverity or passiven) or passive)) or (massivene or massivere))*.