Can I put a tuition fee remission on my CV under scholarships?
Ph.D. studies are fully funded in many countries such as the US and Canada. If you receievd a merit-based scholarship/fellowship then you can certainly put it under the "honors/awards" section of your CV. However, if this scholarship was not awarded on a competitive or merit-based basis, and it was merely the standard package received by most Ph.D. students, it probably does not warrant a line in the CV. 

(This answer assumes you are talking about Ph.D. studies based on the number of years mentioned in the question)