Perhaps you should try some spelling variations:
mathematics studies » mathematical studies, mathematics students, mathematics student
thematic studies » kinematic studies, climatic studies, mathematical studies
thematic study » kinematic study, theoretic study, mathematical 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 (thematic study))))) OR (mathematics study)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "annals of ((((mathematics studies) or (((thematic studies) OR (thematic study))))) or (mathematics study))".
• Adding a wildcard symbol may retrieve word variants: annals of ((((mathematics studies) or (((thematic studies) OR (thematic study))))) or (mathematics study))*.