More results when adding a filter to a search

Hi everyone,

  • I’m doing a simple textual search with some small word (by far to be precise). I get 4 results.
  • Then I’m adding a filters on this search, and I get more results (602).

I would like to understand how it’s possible to get more results when adding a filter ?

(From what I understand: the second one query search everything contains the words by or far and use the filters, which seems pretty logical to me. But I don’t understand why the first query isn’t searching for everything containing one of those 2 words, and it’s only finding entries containing byfar with no space. )