Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivierende » passiveierende, passivenierende, passiverierende, passivierender, aktivierende, passivierung, passivierungde, passierende, passagierende
passivieren » passiveieren, passivenieren, passiverieren, passivierung, passieren, passagieren
massiv » massive
massiveeren » massiveeeren, massivere, massivdecken, massivteilen
massigeren » massiger, massigen, massivere

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