Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivity » passiveity, massivity, passiverity
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passivieren, passieren, passiverer
passiveand » passiveeand, massiveand, passivereand
massiven » massive, massively, massiv
massiveene » massivement, massivere, massereene

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