Perhaps you should try some spelling variations:
"geobioinformatik modelle" » "geoinformatik modelle", "bioinformatik modelle", "geobioinformation modelle", "geobiogeoinformatik modelle", "geobiobioinformatik modelle", "geobioinformatic modele", "geobioinformatic modelse", "geobioinformation modellee"
"information modell" » "information modelle", "information model", "information models"
"informatik modelle" » "information modelle", "geoinformatik modelle", "bioinformatik modelle", "informatic modele", "informatic modelse", "information modellee"
"informatik modell" » "informatic model", "informatic models", "information modelle"

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