Hmm, I don't think you can. Probably because it's copyrighted and is being sold in stores for profit... If the book was simply posted online, no one would buy the physical copy and no one would make any money.
There's this thing called a library. Check it out!
The Fault in Our Stars is protected by copyright, and is therefore unavailable for free online. You can get it for free at your local library, or you can purchase it online for your digital reading device.
