Perhaps you should try some spelling variations:
"informationen aktuelle" » "informationen visuelle", "informationen anteil", "informationen schnelle"
"informatik aktuelle" » "informatik kulturelle", "informatik akademie"
"informatik modell" » "information modell", "informatic model", "informatic models"

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