After completing individual keyword searches for your P, I, and O, click on Search History.
In your Search History, you can combine the P, I, and O searches to create a focused set of search results relating to your PICO(T) question as a whole.
Follow these steps:
You will now have a set of search results (S4) comprised of S1 (Population) AND S2 (Intervention) AND S3 (Outcomes):
The sample search above resulted in a total of 451 results after combining searches.
Your next task is to narrow the search results down by applying Limits and Filters.