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

• 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.")*.