2. Click "Advanced Search" on the right side of the interface to enter the advanced retrieval interface. The upper column is "documents, periodicals, doctoral and master's theses", and the lower column is "input search conditions".
3. Enter a subject. Take "digital teaching" as an example, enter "digital teaching" after the theme, and change the search for "documents" above to "periodicals", so that only periodicals can be retrieved.
4. The default source category is "All Journals", and the following journals are core journals and above, and all can be selected.
5. The search column will display the number of retrieved documents, 63 1, which is the core journals and above. You can download related content as needed.
6. You can also click on related articles according to the topic keyword prompts, which is more targeted than the overall view.