http://www.chess.com/echess/game.html?id=29918857

I really couldn't find a way to win the game. I hate king, rook, pawn endings. Please comment

Timeless

The position after Black's 33rd move ought to be a win (in addition to the pawn plus, you have 2-0 pawns in the center).

According to Nalimov, the position after White's 48th is in fact a draw.

@ tonydal, do you have/know any resource which will explain the concept of how to work out this ending? I do know few tablebases but I am looking to learn the theory.

I always play these things by feeling. And the main thing to remember is that you have 2 center pawns (and one of them is passed) along with a centrally placed king...so often you can sacrifice one (or two) of your other pawns to advance those on the e- and d-files. If you are able to move those two sufficiently far forward (with your king accompanying them) Black will be sunk, even if he is able to capture all of your other pawns.

Tony what should I have done then?

Can't really give you any specific analysis.  Just remember that your two center pawns (plus king) are worth a great deal.  If you can advance them (and get your rook into a strong position, on the seventh for example) you should be able to win.

Thanks I'll take a look into more tomorrow