一无所获

In a sentence

• 尽管他努力寻找证据，他最后还是一无所获。

  Despite his efforts to search for evidence, he ended up empty-handed.

  The phrase '一无所获' is used to describe being completely unsuccessful in obtaining something, in this case, evidence.

• 我们尝试了所有方法，但却一无所获。

  We tried every method but achieved nothing.

  Here, '一无所获' highlights the result of exhausting efforts without gaining any desired outcome, emphasizing the futility of the attempts.

• 在竞赛中，她感到努力了这么久却一无所获。

  In the competition, she felt that she had worked so hard but ended up with nothing.

  '一无所获' is used to express the sentiment of disappointment after putting in significant effort or time but failing to achieve.