Perhaps you should try some spelling variations:
modern purveyors » modern survey, modern purgatory, power purveyor
modern surveys » modern survey, oder surveys, modern surgery
und ihrer » und ihre
und ihr » und ihre

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