Perhaps you should try some spelling variations:
mathematical structures » mathematical structure
mathematics students » mathematics science, mathematics systems, mathematics set
mathematical studies » mathematical study, mathematical sciences, mathematical theories
mathematics studies » thematic studies, mathematics student, mathematics stem

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