Perhaps you should try some spelling variations:
der mathematical » mer mathematical, order mathematical, over mathematical
her mathematical » mer mathematical, other mathematical, over mathematical
models survey » modeling survey, models supply
moral survey » total survey, model survey, global survey
und ihrer » 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 (her mathematical)) ((und ihrer) OR (und ihre)) grenzgebiete. 2. folge, a series of ((moral survey) OR (models survey)) in mathematics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ergebnisse ((der mathematical) OR (her mathematical)) ((und ihrer) or (und ihre)) grenzgebiete. 2. folge, a series of ((moral survey) or (models survey)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse ((der mathematical) OR (her mathematical)) ((und ihrer) or (und ihre)) grenzgebiete. 2. folge, a series of ((moral survey) or (models survey)) in mathematics*.