Perhaps you should try some spelling variations:
"auditive halluzinationen" » "optische halluzinationen", "zustande halluzinationen", "echte halluzinationen"
"olfactory hallucinations" » "gustatory hallucinations", "elementary hallucinations", "olfactory communications"
"auditory hallucination" » "gustatory hallucinations"
"auditory hallucinations" » "gustatory hallucinationss"

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