Perhaps you should try some spelling variations:
"informationsmangel" » "informationsmanager", "informationsempfanger", "informationsangebot"
"informationsmittel" » "informationsmaterial"
"informationsmodell" » "informationsquelle"

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: ("informationsmangel" OR ("informationsmittel" OR "informationsmodell")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"informationsmangel\" or (\"informationsmittel\" OR \"informationsmodell\"))".
• Removing quotes may allow a broader search: ( informationsmangel or ( informationsmittel OR informationsmodell )).
• Adding a wildcard symbol may retrieve word variants: ("informationsmangel" or ("informationsmittel" OR "informationsmodell"))*.