Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, der grenzgebiete
modern purveyors » modern survey, modern purgatory, power purveyor
modern surveys » modern survey, oder surveys, modern surgery
2c a » 12c a, 2 a, c a

Try widening your search to All Fields.

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 mathematik und ((ihrer grenzgebiete) OR (im grenzgebiet)). 2. folge%2c a series of ((modern surveys) OR (modern purveyors)) in mathematics%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%ergebnisse der mathematik und ((ihrer grenzgebiete) or (im grenzgebiet)). 2. folge%2c a series of ((modern surveys) OR (modern purveyors)) in mathematics%22".
• Adding a wildcard symbol may retrieve word variants: %ergebnisse der mathematik und ((ihrer grenzgebiete) or (im grenzgebiet)). 2. folge%2c a series of ((modern surveys) OR (modern purveyors)) in mathematics%22*.