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