Why Voldemort wanted the Prophecy ?

Voldemort only knew a part of the prophecy the part that Snape told him (which he overheard in the hogs head)years ago when he decided to kill Harry. But in The Goblet of Fire when he failed to kill him again in the graveyard he thought he’s missing something some important information that he should know in order to kill Harry Potter and that’s why he wanted the Prophecy to know the secret of his and Harry’s fate.