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

• Performing a fuzzy search may retrieve terms with similar spellings: some ((historical study) OR (historical studies)) and teaching (higher)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: some ((historical study) OR (historical studies)) AND teaching (higher).
• The words AND, OR and NOT may confuse the search; try adding quotes: "some ((historical study) OR (historical studies)) and teaching (higher)".
• Adding a wildcard symbol may retrieve word variants: some ((historical study) OR (historical studies)) and teaching (higher)*.