Search results of a previous query?

Hi all, I am trying to build a script to make "nested" searches in a table. I have a form compossed of a text field and a select dropdown menu with all the fields in the table. The user can write in the text box and then select the field in which to perform the search. This works fine so far...now, I want to show the results of the query, but give the user the possibility of searching again BUT only make the search with the results shown, not the entire table....can anyone give me any ideas of how to do this last part? I tried passing the new queries in the url...but this won't give the user the possibility to search twice in the same field... Any ideas? Thanks before hand.