to take a lot of trouble

• 费心，费心！

  thank you for your trouble!

• 叫你费心了。

  I apologize for the trouble.

• 请不必费心。

  Please do not go to any trouble.

• 您要是见到他，费心把这封信交给他。

  If you see him, could I trouble you to give him this letter?

• 这孩子真让人费心。

  This child really causes a lot of trouble.