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