Perhaps you should try some spelling variations:
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
22ergebnisse der » ergebnisse der, endergebnisse der, undergebnisse der
model surgery » modern surgery, bowel surgery, oral surgery
model survey » models survey, modern survey, moral survey

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