Perhaps you should try some spelling variations:
mathematical testing » mathematical setting, mathematics testing, mathematical teaching
ihrer grenzgebiete » ihren grenzgebieten, der grenzgebiete, deren grenzgebiete
mathematical using » mathematica using, mathematics using, mathematical beings
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
mathematical und » mathematical union, mathematical user, mathematical path
mathematica und » mathematica _, mathematica a
modern surveys » oder surveys, modern purveyors, modern surgery
modern survey » modern surgery, models survey, model 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) OR (((mathematical using) OR (mathematical testing))))) OR (mathematica und)) ((ihrer grenzgebiete) OR (ihre grenzgebiete)). 2. folge, a series of ((modern surveys) OR (modern survey)) in mathematics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ergebnisse der ((((mathematical und) or (((mathematical using) OR (mathematical testing))))) or (mathematica und)) ((ihrer grenzgebiete) or (ihre grenzgebiete)). 2. folge, a series of ((modern surveys) or (modern survey)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse der ((((mathematical und) or (((mathematical using) OR (mathematical testing))))) or (mathematica und)) ((ihrer grenzgebiete) or (ihre grenzgebiete)). 2. folge, a series of ((modern surveys) or (modern survey)) in mathematics*.