Perhaps you should try some spelling variations:
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
der grenzgebiete » die grenzgebiete, dem grenzgebiet, und grenzgebiete
modern survey » modern surgery, models survey, modeling survey
model survey » models survey, model surgery, moral survey
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 ((der grenzgebiete) OR (ihre grenzgebiete)). 2. folge%2c a series of ((((modern survey) OR (model survey))s) OR (((modern survey) OR (model survey)))) in mathematics%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%ergebnisse der mathematik und ((der grenzgebiete) or (ihre grenzgebiete)). 2. folge%2c a series of ((((modern survey) OR (model survey))s) or (((modern survey) OR (model survey)))) in mathematics%22".
• Adding a wildcard symbol may retrieve word variants: %ergebnisse der mathematik und ((der grenzgebiete) or (ihre grenzgebiete)). 2. folge%2c a series of ((((modern survey) OR (model survey))s) or (((modern survey) OR (model survey)))) in mathematics%22*.