404. That’s an error.
The requested URL /add?source=atgs&feedurl=http://muabanquangngai.net/public-rss/rssid&cid=15&title=co-hoi-giao-thuong.rss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http://muabanquangngai.net/public-rss/rssid&cid=15&title=co-hoi-giao-thuong.rss