This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
I looked up some information about a religious group called Happy Science.
In order to bring happiness to Tofugu, Koichi tried to make all of his employees buy a happiness fugu charm for $10,000 each.
She was born under a lucky star and she has so much happiness in her life that she can’t help but cry every day.