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