The original post's HTML (assuming it has not changed in structure since 2012) contains no elements with a class of "table". This explains no results from the search.

We have no idea what your page is, what you are searching for, or how you are looking for it. Assuming your code is not fundamentally broken then we can only assume that the HTML document contains nothing that matches what you are looking for. It could be that what you are searching for is actually the content of a child iframe or dynamically generated/loaded using AJAX or similar.