Perhaps you should try some spelling variations:
der mathematical » her mathematical, mer mathematical, order mathematical
models survey » modeling survey
models 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 ((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 ((und ihren) or (und ihre)) grenzgebieten. 2. folge, a series of ((models survey) or (models supply)) in mathematics*.