Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, deren grenzgebiete
der mathematical » her mathematical, mer mathematical, order mathematical
mathematical und » mathematica und, mathematical union, mathematical using
der grenzgebiete » die grenzgebiete, dem grenzgebiet, ihre grenzgebiete
model surgery » modern surgery, bowel surgery, oral surgery
models survey » modeling survey, models supply
model survey » modern survey, moral 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 und ((ihrer grenzgebiete) OR (der grenzgebiete)). 2. folge, a series of ((((model survey) OR (model surgery))) OR (models survey)) in mathematics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ergebnisse der mathematical und ((ihrer grenzgebiete) or (der grenzgebiete)). 2. folge, a series of ((((model survey) OR (model surgery))) or (models survey)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse der mathematical und ((ihrer grenzgebiete) or (der grenzgebiete)). 2. folge, a series of ((((model survey) OR (model surgery))) or (models survey)) in mathematics*.