Can I set up two Samsung monitors to my mac book air mid 2012?
Can I set up two Samsung monitors to my mac book air mid 2012?

No.

USB does not generally have the bandwidth for video data.

https://support.apple.com/kb/sp650?locale=en_US

This MacBook Air only additional supports one display via the thunderbolt port.


  Dual display and video mirroring: Simultaneously supports full native
  resolution on the built-in display and up to 2560 by 1600 pixels on an
  external display, both at millions of colors