Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, der grenzgebiete
der mathematical » her mathematical, order mathematical, over mathematical
mer mathematical » her mathematical, mpr mathematical, over mathematical
modeling survey » modeling supply, models survey, modeling survival
model surgery » modern surgery, bowel surgery, oral surgery
model survey » models survey, modern survey, moral survey
und ihrer » und ihre, und ihr

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