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

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 "informationsempfanger") OR "informationsmaterial")*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"informationsmangel\" OR \"informationsempfanger\") or \"informationsmaterial\")*".
• Removing quotes may allow a broader search: (( informationsmangel OR informationsempfanger ) or informationsmaterial )*.