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