Protection, Fire Protection, Blast Protection and Projectile Protection level 1, 2, 3 and 4 can't combine together in any armor an book(enchanted book).
There is no word to be seen in the screen using the command (title) using slash command and command block.
Thank you for your report!
However, this issue has been closed as Working as Intended.
Certain enchants are mutually exclusive, meaning you can only have one on a particular item. For more information, see https://minecraft.gamepedia.com/Enchanting
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Feedback – 📖 Game Wiki