The "matches" are really just matches as far as the model typically, and not much more. You'll never be able to find the configuration you want, or close to it, without just using the search inventory systems alone and going through listing after listing, at least with GM.
I use the GMBuypower system online ALL the time and with little tricks in the URL, change how many dealers listed, the mileage radius within which it finds them, etc. The best is when you hit a dealer inventory that doesn't have your model, and select search nearby inventory (other dealers). You can then modify that URL and get up to 50 model matches within whatever range you specify.
Really, the quickest and most accurate way to find EXACTLY the right vehicle is to head to a dealer and have them do a search on the system for it, within whatever distance they choose. This is what's done in vehicle locates & trades, and unlike online, they can actually pick specific models, trims, colors, options, etc. and find only exactly what matches all of those points.
In the meantime, you can play with the GM inventory system and go from there, well, if it's GM you're searching.
