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

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