One of the worst things about Safari's autocomplete for search is that you can't build on a query like you can do with Google Chrome. Once you select a suggested query in Safari's omni-box, it auto submits the search.
While suggested queries are definitely a helpful service, the way that Safari goes about the implementation isn't very efficient. A recently revamped jailbreak tweak called Platinum seeks to improve Safari's search capabilities. Have a look at our full video walkthrough inside to see what I mean.