Collision // Colossus does not appear in search results when searching for:
Type: instant
Color: is one of Red, Green, Black
Sets printed in: all sets back to Core 19
Rules text: +

I can find it until I add the + on the rules text.
It looks like the search is only looking for one side of the split card.
Same thing happens with Assure // Assemble when I look for the word "Elf" or "white"