Perhaps you should try some spelling variations:
"vieweg studium; grundkurs mathematik" » "vieweg studium; vorkurs mathematik"
"related species; grundkurs mathematik" » "related species; vorkurs mathematik", "related aspects; grundkurs mathematik", "related policies; grundkurs mathematik"
"viewed studium; bruckenkurs mathematik" » "reviewed studies; bruckenkurs mathematik"

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