track down

If you track down someone or something, you find them, or find information about them, after a difficult or long search.
如果你track down某人或某物，你会寻找他们，或者在经过艰难或漫长的搜索之后找到关于他们的信息。

He finally managed to track down the book he wanted.
他终于找到了他要的书
She had spent years trying to track down her parents.
她已经花了好多年时间试图追寻父母的下落。