Perhaps you should try some spelling variations:
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
models surveys » modern survey, modest survey, oder surveys
models survey » modeling survey, models supply
model survey » model surgery, modern survey, moral survey
12c a » 12c _

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 OR mathematical) und ihre grenzgebiete. 2. folge%12c a series of ((((models surveys) OR (model survey))) OR (models survey)) in mathematics%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%ergebnisse der (mathematik or mathematical) und ihre grenzgebiete. 2. folge%12c a series of ((((models surveys) OR (model survey))) or (models survey)) in mathematics%22".
• Adding a wildcard symbol may retrieve word variants: %ergebnisse der (mathematik or mathematical) und ihre grenzgebiete. 2. folge%12c a series of ((((models surveys) OR (model survey))) or (models survey)) in mathematics%22*.