search.js

let searchTerms = searchBox.value.match(/\S+/g) || []; // "People's Republic"

$children.filter((_, { textContent }) => ( // "People's Republic of Bangladesh"
  !searchTerms.reduce((all, term) => ( // [ "People's", "Republic" ]
    all && textContent.
             match(/\S+/g). // [ "People's", "Republic", "of", "Bangladesh" ]
             reduce((any, word) => any || word.includes(term), false)  // true
  ), true) // Remove from array to be hidden if all search terms have a match
)).hide();