Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, deren grenzgebiete
der mathematical » mer mathematical, order mathematical, over mathematical
her mathematical » mer mathematical, other mathematical, over mathematical
der grenzgebiete » die grenzgebiete, dem grenzgebiet, ihre grenzgebiete
modern surgery » open surgery, modern slavery
modern survey » models survey, model survey, modeling survey

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: ergebnisse ((der mathematical) OR (her mathematical)) using ((ihrer grenzgebiete) OR (der grenzgebiete)). 2. folge, a series of ((modern survey) OR (modern surgery)) in mathematics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ergebnisse ((der mathematical) or (her mathematical)) using ((ihrer grenzgebiete) or (der grenzgebiete)). 2. folge, a series of ((modern survey) OR (modern surgery)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse ((der mathematical) or (her mathematical)) using ((ihrer grenzgebiete) or (der grenzgebiete)). 2. folge, a series of ((modern survey) OR (modern surgery)) in mathematics*.