Unfortunately I also find the search engine on CGT to be unreliable and not working well, especially with more than one keyword.
For example, yesterday I searched for "mercedes sl 450" and had and empty page, because the search engine interpreted the "sl" keyword as Renderman .sl format.
Basically, all SL Mercedes models can be extremely hard to find if a customer looks for them.
IMHO The search should be reworked and that's very important.