Looks like the special characters (err… Vietnamese symbols?) are no good in Speedreader or at least for the title. I might encourage you to add the tag # bug to your post.
I’m not sure if this could be better suited on # Browser Support and/or # Browser Support > Web Compatibility as I haven’t used Speedreader much, honestly mostly because most articles don’t work well in it and I just read without it. But good of you to share the feedback, hopefully someone can help improve speedreader.