You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: "((children study) OR (child study)) AND teaching (mathematics." OR mathematical.")~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((children study) OR (child study)) AND teaching (mathematics.\" OR mathematical.\")".
• Removing quotes may allow a broader search: ((children study) OR (child study)) AND teaching (mathematics. OR mathematical. ).
• Adding a wildcard symbol may retrieve word variants: "((children study) OR (child study)) AND teaching (mathematics." OR mathematical.")*.