May you be + adjectives ( happy) May you have/find/ be blessed with etc + noun ( happiness) May I go out ?>For polite request. Can I go out? > Its ok since we know what you mean . But, I can also reply " Sure you can go out ,but you may not ( Can is an ability to do something , so going out is surely can be done by you ( but, you may not >meaning permission not given)

None of those examples are correct. Where's the main verb?

May you be healthy and happy is a nice way to end a letter before signing your name.

The phrases you need are "I want you to be happy" and "I wish you happiness".

i also want to know if "wish u happy" is right