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

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 (((theory studien) OR (theory studie)))) texts.
• The words AND, OR and NOT may confuse the search; try adding quotes: "london mathematical ((theory student) or (((theory studien) OR (theory studie)))) texts".
• Adding a wildcard symbol may retrieve word variants: london mathematical ((theory student) or (((theory studien) OR (theory studie)))) texts*.