You own and host something, but it is not searchable at all within your WordPress. This experiment is a bi-product.
When you load the content dynamically, the core WP system does not have access to the actual content. But it can still render your pages properly. And, your searches will fail getting the results.
However, third party Search Engines who cache the entire page’s output, may be able to search/index on your page.
Use tags a lot.