Perhaps you should try some spelling variations:
ihrer grenzgebiete » ihre grenzgebiete, ihren grenzgebieten, der grenzgebiete
mathematical und » mathematical union, mathematical using, mathematical user
mathematica und » mathematica _, mathematica a, mathematica 2
model surgery » modern surgery, bowel surgery, oral surgery
model survey » models survey, modern survey, moral survey

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