Things like this make me appreciate Hangul(한글) more and more. It isn't immediately obvious to me how I can enter basic characters like "国". (I still can't figure it out.)
the traditional version of that character is: 國
type "F" for 囗, and "z" for 戈, if you were using cangjie you'd have to add the extra "口" and "一" but i'm guessing this system proposes that 國 is just 囗 + 戈 because that's good enough to identify what you're going for.
edit: the problem seems to be you need to switch to simplified. "F-q-g-e" got me the character.