It will narrow search results down, but probably not as you'd like if you also check the box for "Search Description", because the types of sellers you're referring to usually include as many automotive makes and models in their descriptions as they can to get hits.
If you're looking for something specific from a VehiCross on Ebay, you're probably better off getting more specific by also choosing a specific parts/ad category from your initial results. As an example, it's not likely that "trunk lid tape" will show up in the "Engine Components" category.