can someone help me with this, i saw people enchanted a lot of enchanment on this item but idk how to do that, recently i try to right click onto my chesplate but it didnt work somehow, i try to add protection 4 and unb 3 mending in chesplate first and later i combine book with mending and blast pro 4 , i saw s.o in this forum said it can work with anvil when i combine book and chesplate like that but unfor for me 
it still didnt work, s.o please tell me why u can do it ??!!!!!!!!!!!
it still didnt work, s.o please tell me why u can do it ??!!!!!!!!!!!