Observation on Advanced Search Behavior in the Knowledge Base

While testing the advanced search functionality in our knowledge base, we observed the following results:

From these examples, it appears that:

In examples 1 to 3, the search uses "AND" logic, returning results that contain all the specified terms.

In example 4, however, the behavior shifts to "OR" logic, likely as a fallback when no exact match is found for all terms.

Suggestion:

To enhance user clarity, we recommend making this fallback behavior transparent, either by displaying a message, providing a UI hint, or including clear documentation about how and when the search logic changes.