How to search for X spells

{"ops":[{"insert":"Hopefully this is in the right place. I'm trying to search my paper collection for X cost cards in specific color combinations but when I type {X} into the mana cost area in advanced search only cards that have just X for the casting cost come up. Is there a way to type it in so that I see all of the cards in the specified colors that have an X plus their additional mana costs in the casting cost and not just the ones that only have an X only and no other mana costs?\n"}]}