Perhaps you should try some spelling variations:
der mathematical » her mathematical, mer mathematical, order mathematical
model surgery » modern surgery, bowel surgery, oral surgery
moral survey » total survey, model survey, global survey
und ihrer » und ihre
und ihr » und ihre

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