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, but this card is to think about optimizing for fumbling fingers.
 Mobile web seems to work fine: https://en.m.wikipedia.org/w/index.php?search=ketup%40