1. how can I add post permanent to search result page; 2. how can I have the right length of excerpt in the page 3. how can I resolve the garbled code problem

I’ve already resolve the question 1 and 2.
please help with the question 3.
thanks

Hello Chan !
I have sent and notified our technical team about this problem. We are checking and fix the issue as soon as possible.

Hi Chan  !
Issue3: To resolve the issue with the Searchform, you can log in to Dashboard > Appearance > Customize > General Setting, add the following code to the Footer Script:

<script>
 jQuery(document).ready(function($){
  $('[name="searchForm"]').on("submit",function(event){
   $(this).find('[name="s"]').val( $.trim( $(this).find('[name="s"]').val() ) );
  });
 });
</script>

Hope this helps !