Can I search for multiple meds, e.g., when unsure about the name?

Yes. Separate search words with semi-colons. This search box is on the Local Formulary tab (first tab):

To exclude the Non-formulary items, check the box (red circle) just above the search box

You can take advantage of the naming conventions, e.g., ACE inhibitors end in “pril”, ARBs end in “sartan”.
You may find these drugs by searching for “pril” or “sartan”. Same for many other drug categories.