Problem with Chinese permalink

Hello, Catch Responsive Pro is a great theme which I've been using for months and it's actually the first time I encounter a serious technical problem. See my website www.vipclinics.ch. I made a Chinese version on a separate domain name (www.vipclinics.hk) and Chinese-language permalinks just won't work. For example http://www.vipclinics.hk/瑞士普菲勒隆鼻與下巴整形手術/ leads to a 404: Page not found (it is not the 404 of my website, it is a generic 404). Short link (http://www.vipclinics.hk/?p=972) is also redirected to the same 404. Thank you so much if anyone has a hint to fix the problem. CA