I stay in china for 2 years, but communication is still a big problem. My Chinese friends tell me to attend some online mandarin course, For example: Hanbridge Mandarin school, Chinesehour, speakmandarin etc...Because I need systematicness Chinese mandarin study. So anyone have good recommendation?

I am not sure if you open this topic for a general questioning about language or because of any idea about a relation between Chinese and Turkish.

If you think Turkish language has a strong relation with Chinese, you might have a big misunderstanding about it, you may be losing time in this forum. But if you ask this question for generally, good luck for you to find someone to answer your question.