- I wish there was something we could do that we haven't already done.
- There is!

5 seconds sound clip from The New Adventures of Winnie the Pooh - A Pooh Day Afternoon (S4E3).

You can hear this line at 00:17:10.430 in the Blu-ray version of the episode.

Quote context

[...]

- No, Pooh. I never should have left the dog alone. It was my responsibility.

- But you didn't leave him alone, Christopher Robin. You left him with us.

- I better figure out what I'm gonna tell the neighbors.

- Maybe you could break it to him easy. Like, tell him how much they'll save on dog food from now on.

- Oh, poor Christopher Robin.

- I wish there was something we could do that we haven't already done.

- There is!

- I'm gonna find that dog!

- I don't know how, I don't know where, I don't know when. Boy, I sure don't know much. But I do know this is my responsibility, and I'm gonna do something about it.

- If only I had a clue... Anything!

- I'll follow 'em to the ends of the earth, across oceans, over mountains, as far as I can go! Without crossing the street, of course.

[...]