Reading a Micron 29F32G08QAA NAND Flash IC
It looks like you can get the datasheet for the flash chip and thereby rig up something to read the bits.  However, that may be a long way from recovering the data.  Somewhere in the pile of bits is control information private to the flash drive, probably some wear levelling data, and then file system structures as seen by the operating system.

You should be able to get info on the file system (probably FAT32), but the private flash drive structures and how/where it actually stores the data is unlikely to be specified publicly.  I think the best bet is to get another flash drive of the exactly the same model, replace your flash chip into that drive, and hope no additional state is stored in non-volatile memory in the controller.