<div class="container">
<form>
<div class="input-group">
<input name="songs" id="songs" type="text" class="form-control form-control-no-focus" autocomplete="off" placeholder="Search song title ">
<div class="input-group-append">
<button class="btn btn-secondary btn-no-focus demo-button-search" type="button">
<i class="fa fa-search"></i>
</button>
</div>
</div>
</form>
</div>

<link href="https://cdn.datatables.net/1.12.1/css/jquery.dataTables.min.css" rel="stylesheet" type="text/css">
<script src="https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-3-typeahead/4.0.2/bootstrap3-typeahead.min.js"></script>

<script>
$(function() {
$('#songs').typeahead({
hint: true,
highlight: true,
minLength: 2,
maxLength: 10,
maxItem: 10,
source: function(query, result) {
$.ajax({
url: "data.php",
method: "POST",
data: {
query: query
},
dataType: "json",
success: function(data) {
result($.map(data, function(item) {
return item;
}));
}
})
}
});
});
</script>

<?php
$conn = new mysqli ("server", "user", "password", "database");
mysqli_set_charset ($conn, "utf8");
if ($conn -> connect_error) {
die ("Error: " . $conn->connect_error);
}

$data = array();
$sql = "SELECT song, artist FROM top_100_songs 
WHERE song LIKE '%".$request."%' OR artist LIKE '%".$request."%' 
AND list_eu > 21.000 LIMIT 0, 40";
$result = $conn -> query($sql);

while ($row = $result -> fetch_assoc()) {
$data[] = $row["song"].' - '.$row["artist"];
}

echo json_encode($data);
$conn -> close();
?>