with no way of

• 无从取得

  no way of obtaining

• 无从知道

  no way of knowing

• 无从下手

  not know where to start

• 事情复杂，令人无从下手。

  This matter is complicated, making it difficult for people to know where to start.

• 时代久远，无从查考。

  It was a long time ago, and there is no way to investigate.