Sure, I'm sure that they have absolutely no trouble exiting China (border controls) and travelling the thousands of miles to Syria (without attracting the attention of customs and immigration officials of the various intervening territories). There are sure to be plenty of rest stations along they way, where they can stock up on disposable diapers, tampons, food, and drink.
Regards,
https://en.wikipedia.org/wiki/Chinese_people_in_Turkey
http://www.uyghurensemble.co.uk/en-html/uyghurs-diaspora.html