They are two different pieces of software so the answer is different for each. But given the example of searching for a Farmall M, here is how you do it on each:
Photo Ad Search
1. Click Advanced Search
2. Enter Farmall M
3. Select "all terms" under "Ads Must Match"
4. Select "Tractors" under "From the following category".
Enter +"FARMALL" +"M" in the Search For box
You will get a better set of returns. Not perfect but close.