Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passive » massive, passivere
passivieren » massivieren, passiverieren, passivierende, passivierung, passieren
passiveeeer » massiveeeer, passivereeeer, passiverwerb
passiverer » massiverer, passivererer, passiverwerb, passiver, passieren

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