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
models survey » modeling survey, models supply
modern survey » modern surgery, model survey, modeling survey
model surgery » modern surgery, bowel surgery, oral surgery

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 ((((models survey) OR (modern survey))) OR (model surgery)) 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 ((((models survey) or (modern survey))) or (model surgery)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse der mathematical und ((ihrer grenzgebiete) OR (der grenzgebiete)). 2. folge, a series of ((((models survey) or (modern survey))) or (model surgery)) in mathematics*.