How to get a X-visa while you're staying in China on a F-visa?

[Jimme Deknatel]

This summer I will follow a Chinese language program at Tsinghua university for 5 months, but after that I'm going to do an internship at a company for 4 months. So I'm staying for 9 months in China. The Visa application centre (in The Netherlands) told me that I can't get an X visa because I do 2 different things in China (study , internship) and that can only get an F-visa with a duration of 6 months.

They told me that there may be a possibility that I can extend it when I'm in China. Can someone tell me if an university (Tsinghua) or some other institution can arrange this for me and what papers and forms I need to have to succeed (to get an X-visa while I'm living in China on a F-visa) without any problems ?

Thanks