Perhaps you should try some spelling variations:
"auditive halluzinationen" » "optische halluzinationen", "zustande halluzinationen", "mit halluzinationen"
"echte halluzinationen" » "echten halluzinationen", "mit halluzinationen", "und halluzinationen"

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