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