Search: all terms matching

I’ve just implemented the search function on my site. I can’t figure out how to perform a search where the results match ALL the terms of the query (searching for “iron maiden” is not the same to search for “iron” and “maiden”). What I’m missing?

thank you in advance
Francesco

Kirby’s search uses or logic instead of and. There a plugin to the rescue: https://github.com/bvdputte/kirby-bettersearch