Perhaps you should try some spelling variations:
"geoinformatic model" » "geoinformatik modelle", "geoinformation models", "bioinformatics model"
"information modell" » "information modelle", "information model", "information models"
"informatik modelle" » "informatik modell", "information modelle", "geoinformatik 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: (("information modell") OR ((("informatik modelle") OR ("geoinformatic model")))).
• Removing quotes may allow a broader search: (( information modell ) or ((( informatik modelle ) or ( geoinformatic model )))).
• Adding a wildcard symbol may retrieve word variants: (("information modell") or ((("informatik modelle") or ("geoinformatic model"))))*.