Perhaps you should try some spelling variations:
mathematical union » mathematical function, mathematical question, mathematical solution
mathematical using » mathematica using, mathematics using, mathematical testing
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, der grenzgebiete
mathematical user » mathematics user, esomathematical uses, mathematical museums
mathematical und » mathematica und, mathematical path, mathematical boundary
modern surveys » modern survey, oder surveys, modern purveyors

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