搜索枯肠

sōu suǒ kū cháng

to rack one's brains (for apt wording etc) (idiom)

搜

sōu

(bound form) to collect; to gather

索

suǒ

abbr. for 索馬里|索马里[Suo3 ma3 li3], Somalia

枯

kū

(of plants) withered

肠

cháng

intestines