粵典 (words.hk)香港詞
用盡精力,費盡腦筋都諗唔到方法或者構思 (to rack one's brain; to think very hard; literally: to exhaust the juice of the brain)
動詞用例
我絞盡腦汁都諗唔到好嘅辦法。
ngo5 gaau2 zeon6 nou5 zap1 dou1 nam2 m4 dou2 hou2 ge3 baan6 faat3.
I racked my brain on this issue and still nothing feasible come forth.