Perhaps you should try some spelling variations:
"experimentiersystem" » "experimentalsystem", "experimentalsysteme", "experimentierten"
"experimentierte" » "experimentieren", "experimentier", "experimentierfeld", "experimentierene", "experimentierense", "experimentinge"
"experimentiert" » "experimentieren", "experimentierens", "experimenting"

Try widening your search to All Fields.

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: ("experimentiersystem" OR ("experimentierte" OR "experimentiert")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"experimentiersystem\" or (\"experimentierte\" OR \"experimentiert\"))".
• Removing quotes may allow a broader search: ( experimentiersystem or ( experimentierte OR experimentiert )).
• Adding a wildcard symbol may retrieve word variants: ("experimentiersystem" or ("experimentierte" OR "experimentiert"))*.