Perhaps you should try some spelling variations:
ihren grenzgebieten » ihre grenzgebiete
ihrer grenzgebiete » ihre grenzgebiete, der grenzgebiete, deren grenzgebiete
mathematical union » mathematical function, mathematical question, mathematical solution
mathematical using » mathematica using, mathematics using, mathematical testing
mathematical path » mathematical part, mathematical place, mathematical psnr
mathematical und » mathematica und, mathematical user, mathematical boundary
oder surveys » der surveys, other surveys, cover surveys

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