Perhaps you should try some spelling variations:
oder surveys » other surveys, cover surveys, our surveys
user surveys » use surveys, user survey, cluster surveys
der surveys » deep surveys, diet surveys, d surveys
mathematik » mathematical

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 im grenzgebiet. 2. folge, a series of ((((oder surveys) OR (user surveys))) OR (der surveys)) in mathematics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ergebnisse der mathematik und im grenzgebiet. 2. folge, a series of ((((oder surveys) OR (user surveys))) or (der surveys)) in mathematics".
• Adding a wildcard symbol may retrieve word variants: ergebnisse der mathematik und im grenzgebiet. 2. folge, a series of ((((oder surveys) OR (user surveys))) or (der surveys)) in mathematics*.