help needed with basic search

Hi all,

I am trying to create a list from a page link, ie stock-listings.php?willows=1 AND stock_type=New

I can get the link to work if searching against just one record but cannot get it to work when trying to search against two values, I have tried using &, AND, and and even , between the values but nothing works for me I am obviously missing something in respect of correct syntax but cannot see what.

Both searches work on their own but not when I try to combine them.

The search needs to be carried out from values within the link not the display page, I am sure the solution is simple but all google searches seem to relate to doing the filtering within the code on the listing page not the link which is what I need.

Can this be done? if so any help to achieve this would be appreciated.

Thanks in advance.