You cannot see the book a villager is trading if you haven't unlocked the level yet. If your villager is currently level 1 and the book you want to get is at level 2, it will not show you the enchantment.
Nevkip
You cannot see the book a villager is trading if you haven't unlocked the level yet. If your villager is currently level 1 and the book you want to get is at level 2, it will not show you the enchantment.