The best thing to do with any shy kitten is to be in their space and ignore them; reading a book or playing on your phone are good ways to pass the time. They will eventually get bored with hiding and come investigate. As tough as it is, continue ignoring them. They need to decide you are harmless, and any movement toward them could be misinterpreted as aggression and set things back. Once they decide you're not a threat, then they will be more open to interacting with you. Ease into it gradually, and once they learn each step is safe, they will work up the courage to take the next one.