Mobile users often misspell queries. Search should provide good results even when the query isn't completely coherent. For example, if I search for "ketup@", search suggestion knows I mean ketchup but doesn't search doesn't return any results. The above example was worked from the Android app which may require client side improvements[0], but this card is to think about optimizing for fumbling fingers.
[0] Mobile web seems to work fine: https://en.m.wikipedia.org/w/index.php?search=ketup%40