Perhaps you should try some spelling variations:
ihre grenzgebiete » ihren grenzgebieten, die grenzgebiete, im grenzgebiet
odiet surveys » diet survey, budget surveys, exit surveys
diet surveys » budget surveys, best surveys, art surveys

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 mathematik und ihre grenzgebiete. 2. folge, a series of ((odiet surveys) OR (diet surveys)) in mathematics.
• Adding a wildcard symbol may retrieve word variants: ergebnisse der mathematik und ihre grenzgebiete. 2. folge, a series of ((odiet surveys) or (diet surveys)) in mathematics*.