Perhaps you should try some spelling variations:
mathematics students » mathematics science, mathematics systems, mathematics set
mathematics studies » mathematical studies, mathematics student, mathematics stem
thematic studies » kinematic studies, climatic studies, thematic study

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