Perhaps you should try some spelling variations:
"information modell" » "information modelle", "information model", "information models"
"informatik modelle" » "informatik modell", "information modelle", "bioinformatik modelle"
"geoinformatik modelle" » "geoinformatik modell", "geoinformation modelle", "geobioinformatik modelle"

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