"Good health, peace and joy" means: "I wish the other party smooth sailing, peace, smooth sailing, happiness, no interference from illness and everything is fine."
"Health" in health and success refers to blessing a person in good physical, mental and social conditions. And "smooth" means that everything is in line with people's wishes and goes smoothly. Peace in "peace and joy" means that there are no accidents, stability and safety; "Xi" means joy and happiness, which is short for love and listening.