Search does not work with non Latin characters and fck editor. (For example Greek characters).
I upgrade from version 4.4.1 to version 4.5.1, and  the last version has the fck editor as default editor.

With the installation 4.4.1 (default editor ftb3), the search function in  pages with html module

and words in Latin and non Latin characters work ok.

In version 4.5.1 (default editor fck) the search for words in non Latin alphabet does not return results.

I modify the web.config and install the ftb3 editor from previous version and the problem is solved.

Search return results for Latin and non Latin characters.

This problem is editor specific or core specific problem ?

Does some one have any idea ?