to find joy in sorrows (idiom) / to enjoy sth in spite of one's suffering
惊喜若狂
jīng xǐ ruò kuáng
pleasantly surprised like mad (idiom) / capering madly with joy / to express boundless pleasure
为善最乐
wéi shàn zuì lè
doing good deeds brings the greatest joy (idiom)
乐开花
lè kāi huā
to burst with joy
七情
qī qíng
seven emotional states / seven affects of traditional Chinese medical theory and therapy, namely: joy 喜[xi3], anger 怒[nu4], anxiety 憂|忧[you1], thought 思[si1], grief 悲[bei1], fear 恐[kong3], fright 驚|惊[jing1] / seven relations
喜不自禁
xǐ bù zì jīn
unable to contain one's joy (idiom)
喜则气缓
xǐ zé qì huǎn
joy depresses one's qi vital breath / an excess of joy may lead to sluggishness of vital energy (TCM)
lit. the happy fate of the man from Qi (who had a wife and a concubine) (idiom) / fig. (ironically) the joy of having several partners / the life of a pasha
于归之喜
yú guī zhī xǐ
the joy of matrimony (polite phrase referring to a young woman)
幸甚至哉
xìng shèn zhì zāi
filled with joy (quotation from poems by Cao Cao 曹操[Cao2 Cao1])
吃别人嚼过的馍不香
chī bié rén jiáo guò de mó bù xiāng
lit. bread previously chewed by someone has no flavor (idiom) / fig. there's no joy in discovering something if someone else got there first