DICT.TW Dictionary Taiwan

 鑽牛角 [ㄗㄨㄢ ㄋㄧㄡˊ ㄐㄧㄠˇ; zuan1 niu2 jiao3]
 lit. honing a bull's horn; 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
 same as idiom 鑽牛角尖
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