Perhaps you should try some spelling variations:
"vieweg studium; grundkurs mathematik" » "vieweg studium; bruckenkurs mathematik", "vieweg studium; vorkurs mathematik", "vieweg studium; grundkurs informatik", "viewed studium; grundkurs mathematik"
"reviewed studies; grundkurs mathematik" » "reviewed studies; bruckenkurs mathematik", "reviewed studies; vorkurs mathematik", "reviewed studies; grundkurs informatik", "review studies; grundkurs mathematik", "related studies; grundkurs mathematik", "repeated studies; grundkurs mathematik"
"resolved studies; grundkurs mathematik" » "resolved studies; bruckenkurs mathematik", "resolved studies; vorkurs mathematik", "resolved studies; grundkurs informatik"

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: (("vieweg studium; grundkurs mathematik") OR ((("reviewed studies; grundkurs mathematik") OR ("resolved studies; grundkurs mathematik")))).
• Removing quotes may allow a broader search: (( vieweg studium; grundkurs mathematik ) or ((( reviewed studies; grundkurs mathematik ) or ( resolved studies; grundkurs mathematik )))).
• Adding a wildcard symbol may retrieve word variants: (("vieweg studium; grundkurs mathematik") or ((("reviewed studies; grundkurs mathematik") or ("resolved studies; grundkurs mathematik"))))*.