Perhaps you should try some spelling variations:
"geoinformation modelle" » "geoinformation models", "information modelle", "die informationsmodelle"
"informatik modelle" » "information modelle", "bioinformatik modelle", "informatic model", "informatic modele", "informatic modelse"
"geoinformatik modelle" » "geoinformation modelle", "geobioinformatik modelle", "geoinformatic model", "geoinformatic modele", "geoinformatic modelse"
"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 modelle") OR ((("geoinformatik modelle") OR ("geoinformation modelle")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"informatik modell\") or (((\"informatik modelle\") or (((\"geoinformatik modelle\") OR (\"geoinformation modelle\"))))))".
• Removing quotes may allow a broader search: (( informatik modell ) or ((( informatik modelle ) or ((( geoinformatik modelle ) OR ( geoinformation modelle )))))).
• Adding a wildcard symbol may retrieve word variants: (("informatik modell") or ((("informatik modelle") or ((("geoinformatik modelle") OR ("geoinformation modelle"))))))*.