Recommend books from a description

Book recommendations from a mood, theme or subject in the reader's own words: "cozy fantasy with found family", "a good book about grief", "something light for the beach". Matches on meaning rather than on a title or an author name. For a reader who has linked their Siftivo account, the results leave out books already in their library and books they hid, avoided or recently passed on, and a result that fits their taste says why.