Perhaps you should try some spelling variations:
experimentierten » experimentieren, experimentierens, experimentiere, experimentierenen, experimentierensen, experimentingen, experimentierenn, experimentiern, experimentierfeldn
experimentiert » experimentieren, experimentierens, experimenting
experimentierte » experimentierene, experimentierense, experimentinge, experimentieren, experimentier, experimentierfeld

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: ( (experimentierten OR experimentiert) OR experimentierte ).
• Adding a wildcard symbol may retrieve word variants: ( (experimentierten or experimentiert) or experimentierte )*.