You may try to install account-plugin-haze and you can find QQ. It worked before until Tencent changed some security protocols such that any account attempted to login via unofficial clients would be kicked or even locked.

You may do some research on it. May be you can find a way to make it work again, then millions Chinese will thank you. ^^

Note: Before performing your research, make sure you've setup the password recovery for your QQ acount, otherwise you'd not be able to get back your locked QQ.