Change screen res, Intel HD 4000..

Hello,

I have an Acer V3-571G, with Intel HD 4000 and Nvidia GeForce 630M 2GB.

Now I would like to set te screen resolution higher, but it's only possible till 1366 x 768 (60hz).

How can I make it to a higher res, so that the Windows 8.1 screen is a little bit smaller..

Thanks in advance.