thank you very much for their ( I don't understand "for their")

Hello everyone._I'm a Chinese girl from China._There areI have some (of my) friends here._They give me a lot of help._Thank you very much (for their ???).

You might also have said:

"There are some friends here who give me a lot of help"

In Chinese, I think, commas (,) are more common.  In English it is often necessary to use a period (.) and begin a new sentence.