arale device, r170, ubuntu- touch/vivid- proposed

Steps
1. launch System Settings
2. open the search bar
3. input some keywords

Result
There are irrelevant items also returned.
e.g.
input "Sound", shows "Sound", "Accounts"
input "at", shows "Cellular", "Sound", "Language & Text", "Notifications", "Battery", "Brightness", "Time & Date", "Updates"

<https:/ /wiki.ubuntu. com/SystemSetti ngs#Interpretin g_search_ text>: "Any word in the search string that is followed by a space or punctuation should be treated as a a complete word, while any word that is not should be treated as if it might be either a complete word or the beginning of a word."