debug and fix search for category on osclass site

Hi, The project is simple, see this page: [login to view URL] Now try to search by year, make, model, type [login to view URL] transmission. They don't work. The one ad for the subaru 1.6 is a test ad so you can use the fields to test with. What is required is to first, debug and fix the issue with the search to get it working efficiently. Then test the results page and the associated search terms in the header of the results page, i.e. it should state the terms of the search, at present it will show a blank. And second, upon a successful solution to this, provide a list of files and/or database changes. This is critical as we will need to be able to emulate this on our live servers. For anyone familiar with this solution it should take them very little time to fix this so am expecting a reasonable quote as well as time frame but naturally 100% fulfilment of the requirements in both quality and efficiency of code. The fix is only far the car category as we will migrate the fix to the other categories. PLEASE READ THIS BEFORE QUOTING.