Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, der grenzgebiete
mathematical user » mathematics user, mathematical using, esomathematical uses
mathematical und » mathematical union, mathematical using, mathematical path
mathematica und » mathematica _, mathematica a
modern survey » modern surgery, model survey, modeling survey
models survey » modeling survey, models supply

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