Selections across different taxonomy categories are combined using AND logic, meaning every category you filter on must match for a record to appear in results.
This produces a progressively narrower, more refined search — the more categories you select from, the fewer results you'll see.
File Types: PDF
AND
Document Types: Policy
AND
Terms: Compliance
The example above returns only records that are PDFs and classified as Policies and tagged with Compliance — not records matching any one of those individually.