The 3 star threshold on Year of the Dragon level 1-2 is pretty low, so there are a few ways to do this. One way is to lob the Orange bird up over the ledge with the TNT, so it comes down and destroys the far right pigs. At that point you can just use the White and Yellow birds to mop things up. Alternatively, try firing the Orange straight ahead, expanding when it passes the helmet pig. The score in the video below is 74,530.