Perhaps you should try some spelling variations:
"geoinformation modelle" » "geoinformation models", "information modelle", "die informationsmodelle"
"geoinformatic model" » "geoinformation models", "bioinformatics model", "bioinformatics models", "geoinformatic models", "geoinformation model", "geoinformative model"
"informatik modelle" » "information modelle", "bioinformatik modelle", "informatic models", "informatic modelse", "information modellee"
"geoinformatik modelle" » "geoinformation modelle", "geobioinformatik modelle", "geoinformatic models", "geoinformatic modelse", "geoinformation modellee"
"informatik modell" » "information modell", "informatic models", "information modelle"
"informatic model" » "informatic models", "information model", "informative model"

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