Perhaps you should try some spelling variations:
"ambulanter" » "ambulanten", "ambulantenr"
"ambulantenr" » "ambulanten", "ambulanzen", "ambulantem", "ambulantennr"
"ambulantes" » "ambulanten", "ambulance", "ambulant", "ambulantens"
"ambulante" » "ambulanten"

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