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    <!--- Chặn View Source - F12 --->
<script type="text/javascript">
    document.addEventListener("keydown", function(event) {
        // Chặn F12
        if (event.key === "F12") {
            event.preventDefault();
        }
        // Chặn Ctrl+Shift+J
        if (event.ctrlKey && event.shiftKey && event.key === "J") {
            event.preventDefault();
        }
    });

    // Chặn view-source
    document.addEventListener("contextmenu", function(event) {
        event.preventDefault();
    });
</script>

<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=AW-11565372370"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'AW-11565372370');
</script>
<!-- Event snippet for Lượt xem trang conversion page -->
<script>
  gtag('event', 'conversion', {'send_to': 'AW-11565372370/F-VcCIL-6ZQaENKn5oor'});
</script>
<!-- Event snippet for Lượt xem trang conversion page
In your html page, add the snippet and call gtag_report_conversion when someone clicks on the chosen link or button. -->
<script>
function gtag_report_conversion(url) {
  var callback = function () {
    if (typeof(url) != 'undefined') {
      window.location = url;
    }
  };
  gtag('event', 'conversion', {
      'send_to': 'AW-11565372370/F-VcCIL-6ZQaENKn5oor',
      'event_callback': callback
  });
  return false;
}
</script>