I emptied out my pockets but could not find my keys.

我把口袋里的东西都掏了出来，仍然找不到我的钥匙。

《牛津词典》

He fetched his map, and looked for the castle, but could not find it.

他把他的地图拿来，开始寻找城堡，但没有找到。

youdao

She looked everywhere for him but could not find him.

四处寻找，但没有找着。

youdao

They wanted to hold it there but could not find a place.

VOA: special.2009.08.10

If you look really carefully, you could find it was not a single line but two lines, and Bohr is silent on such matters.

如果你仔细观察的话，会发现这是两条谱线而非一条，对这一研究，波尔不得不沉默。

麻省理工公开课 - 固态化学导论课程节选

They went to one man's home but could not find him there.

VOA: special.2009.09.07

Ipswich pushed for a winner after King's dismissal but could not find a way through the Coventry defence.

BBC: Sport - Football - Coventry 1-1 Ipswich

The shell-shocked Saints pushed for an equaliser but could not find a way through a resolute Rangers back-line.

BBC: St Mirren 0-1 Rangers

Lita scored on that occasion at Carrow Road but could not find the back of the net in Arnhem.

BBC: SPORT | Football | Internationals | Pearce calls for U21 improvement