Search for Invoice Lines?

Maybe I'm missing something, because this seems quite fundamental.

I want a way to search all existing invoices for the contents of specific line items. Is that possible from somewhere?

To explain the use case, it's often useful to check historic pricing for a particular customer in my line of business. So I would want to search for, say, 'web copy', and be able to see what I've charged that customer for web copy before.

Doable?

Thanks!