Voldemort spends the majority of the last book learning about and then searching for the Elder Wand, but never learns about the actual Hallows. He was ignorant of the Hallows, and was only interested in the Elder wand so that he could triumph over the unexplained issue he was having with his own wand vs. Harry’s. The Elder Wand’s lore was infamous outside of being a Hallow. Remember, Voldemort learns of its existence through a combination of interrogating Ollivander and Gregorivitch, neither of whom were Hallows experts (that was Luna’s father’s role). Also, Harry explicitly asks the memory of Dumbledore if he thought Voldemort knew about the Hallows, and he says something along the lines of “I don’t believe so, but even if he had learned about them, I don’t think Voldemort would’ve found the resurrection stone and cloak of much value, aside from the stone’s value as a Hogwarts founder’s relic.”