Multiple word search, (search engine style)

We are able to search by fields, but what about searching words on word or pdf files (with text) or even in long text fields.

User would be able to find registers that contain several words like for example companies that sell hats, pants & shoes searching through a description field.
Is there any way to do it on a simple search box like a search engine? Would you like to have this functionality developed?

B.R. Roberto.