A series of bombings in Baghdad killed at least 33 people and wounded dozens more on Thursday, Iraqi officials said. At least three of the bombs struck Adhamiya, a largely Sunni neighborhood in northern Baghdad, and killed 22 people, the police said. Other blasts in western Baghdad killed 11 people, officials said. Ghazwan Naji, a resident of the western Baghdad neighborhood of Amiriya, said his 7-year-old son had heard so many explosions that he could distinguish the different kinds of bombs. “We’ve become experts in this, in death,” Mr. Naji said.