You can also load like this way:
echo "<script src="https://wordpress.stackexchange.com/questions/398683/".plugins_url("your_plugin_folder_name/assets/js/search.js')."'></script>";
You can also load like this way:
echo "<script src="https://wordpress.stackexchange.com/questions/398683/".plugins_url("your_plugin_folder_name/assets/js/search.js')."'></script>";