The search tool is updated to add a new option :


New option for combining keywords

When keywords are typed, space separated, each can be logically linked to the other either with a AND or with a OR. With a AND, it means the search must match all keywords in the content in order to produce a valid search result. With a OR, it means any matching keyword can produce an actual search result.

In other words, combining search keywords with a AND systematically produces less actual results than with a OR. Depending on what you are looking for, one option is better than the other.