Perhaps you should try some spelling variations:
mathematics students » mathematics science, mathematics systems, mathematical studies
mathematics studies » mathematical studies, thematic studies, mathematics student
mathematics set » mathematics thema

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: annals of ((((mathematics studies) OR (((mathematics students) OR (mathematics set))))) OR (mathematics study)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "annals of ((((mathematics studies) or (((mathematics students) OR (mathematics set))))) or (mathematics study))".
• Adding a wildcard symbol may retrieve word variants: annals of ((((mathematics studies) or (((mathematics students) OR (mathematics set))))) or (mathematics study))*.