Perhaps you should try some spelling variations:
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
modern purveyors » modern purgatory
power purveyor » porter surveyor
modern survey » modern surgery, models survey, model survey

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