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