Correct
钻牛角尖
/ zuān niújiǎo jiān /
Strokes
Definition
lit. to penetrate into a bull's horn (idiom); fig. to waste time on an insoluble or insignificant problem/to bash one's head against a brick wall/a wild goose chase/a blind alley/to split hairs
Example
As a Verb
take unnecessary pains to study an insignificant or insoluble problem; split hairs
As a Verb
get into a dead end; get into a blind alley