[zhù yuàn]

wish sb. happiness
祝愿某人快乐

with best wishes
谨致良好的祝愿

I wish you good health and happiness.
祝愿您健康、 幸福。

We wish your country evergrowing prosperity.
祝愿贵国日益繁荣昌盛。

Please accept my best wishes for your happiness and success.
请接受我最良好的祝愿， 祝你幸福和成功。