Use the Search History / Alerts area, beneath the search boxes, to view your searches and the number of results for each one. (Select Search History beneath the search boxes if the Search History / Alerts section is not already displayed.)
You can use the Search History to:
To combine searches, use the checkboxes to the left of each search line to select the lines that you want to combine, then select either the Search with AND or Search with OR button, above the list of search lines.
If you are aiming to conduct an inclusive search, it is a good idea to combine a thesaurus term (or subject heading) search and a free text search for each of your target concepts. For example, ((MH "Anesthesia+") OR (anaesthesia or anesthesia)).
You can also remove searches by ticking the relevant checkboxes and then clicking the Delete Searches button.
Click on Edit to:
Search Terms column
Search Options column
By default, Apply equivalent subjects is selected under the heading Expanders, and Boolean/Phrase is selected under Search modes. You can click on Edit in the Actions column to change these selections.
The Actions column shows:
AND retrieves articles which contain all of your concepts. For example, if you are interested in the use of cognitive behaviour therapy for gambling disorders, you would search for cognitive behaviour therapy AND gambling.
OR retrieves records which contain any of your concepts. For example, you might search for cognitive behaviour therapy OR CBT to retrieve all articles on the topic.