Me ayudan a que este buscador funcione?

var $filters = $('.filter [data-filter]')
  , $boxes = $('.boxes [data-category]');
$filters.on('click', function(e) {
    e.preventDefault();
    var $this = $(this);
    $filters.removeClass('active');
    $this.addClass('active');
    var $filterCategory = $this.attr('data-filter');
    if ($filterCategory == 'all') {
        $boxes.removeClass('is-animated').fadeOut().promise().done(function() {
            $boxes.addClass('is-animated').fadeIn();
        });
    } else {
        $boxes.removeClass('is-animated').fadeOut().promise().done(function() {
            $boxes.filter('[data-category = "' + $filterCategory + '"]').addClass('is-animated').fadeIn();
        });
    }
});
$(document).ready(function() {
    $('#buscar').on('input', function() {
        var value = $(this).val().toLowerCase();
        $('.boxes > .card-wrapper').filter(function() {
            $(this).toggle($(this).find('div').attr('title').toLowerCase().indexOf(value) > -1)
        });
    });
});
window.onclick = function(event) {
    if (event.target.matches('.card')) {
        var dropbuttons = document.getElementsByClassName("card");
        for (var i = 0; i < dropbuttons.length; i++) {
            var openDropdown = dropbuttons[i];
            if (openDropdown.classList.contains('show') && !event.target.classList.contains('show')) {
                openDropdown.classList.remove('show');
            }
        }
        event.target.classList.toggle("show");
    }
}
document.addEventListener("DOMContentLoaded", function() {
    var e;
    if ("IntersectionObserver"in window) {
        e = document.querySelectorAll(".lazy");
        var n = new IntersectionObserver(function(e, t) {
            e.forEach(function(e) {
                if (e.isIntersecting) {
                    var t = e.target;
                    t.src = t.dataset.src,
                    t.classList.remove("lazy"),
                    n.unobserve(t)
                }
            })
        }
        );
        e.forEach(function(e) {
            n.observe(e)
        })
    } else {
        var t;
        function r() {
            t && clearTimeout(t),
            t = setTimeout(function() {
                var n = window.pageYOffset;
                e.forEach(function(e) {
                    e.offsetTop < window.innerHeight + n && (e.src = e.dataset.src,
                    e.classList.remove("lazy"))
                }),
                0 == e.length && (document.removeEventListener("scroll", r),
                window.removeEventListener("resize", r),
                window.removeEventListener("orientationChange", r))
            }, 20)
        }
        e = document.querySelectorAll(".lazy"),
        document.addEventListener("scroll", r),
        window.addEventListener("resize", r),
        window.addEventListener("orientationChange", r)
    }
});

$(document).ready(function() {
    $('#buscador').on('input', function() {
        var value = $(this).val().toLowerCase();
        $('.list-group > .flex-container > a').filter(function() {
            $(this).toggle($(this).data('filter-name').toLowerCase().indexOf(value) > -1)
        });
    });
});