Perhaps you should try some spelling variations:
london mathematical » non mathematical, common mathematical, motion mathematical
theorien studien » theorie studie, theories studies, theorie studieren
theory student » theory students, theory studien, theory studying

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: london mathematical ((theory student) OR (theorien studien)) texts.
• Adding a wildcard symbol may retrieve word variants: london mathematical ((theory student) or (theorien studien)) texts*.