Perhaps you should try some spelling variations:
22ergebnisse der » ergebnisse der, endergebnisse der, undergebnisse der
der grenzgebiete » die grenzgebiete, dem grenzgebiet, ihre grenzgebiete
modern survey » modern surgery, model survey, modeling survey
models survey » modeling survey, models supply
20 a » 20 _

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: %22ergebnisse der (mathematik OR mathematical) und der grenzgebiete. 2. folge%((20 a) OR (c a)) series of ((((modern survey) OR (models survey))s) OR (((modern survey) OR (models survey)))) in mathematics%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22ergebnisse der (mathematik or mathematical) und der grenzgebiete. 2. folge%((20 a) or (c a)) series of ((((modern survey) OR (models survey))s) or (((modern survey) OR (models survey)))) in mathematics%22".
• Adding a wildcard symbol may retrieve word variants: %22ergebnisse der (mathematik or mathematical) und der grenzgebiete. 2. folge%((20 a) or (c a)) series of ((((modern survey) OR (models survey))s) or (((modern survey) OR (models survey)))) in mathematics%22*.