Google PRINCIPLES OF MOBILE SITE DESIGN: DELIGHT USERS AND DRIVE CONVERSIONS - Manual (Page 14)

6. ENSURE SITE SEARCH
RESULTS ARE RELEVANT
Participants didn’t bother to swipe through multiple
pages of search results. Instead, they judged a site’s
search based on the results it returned first, so make
sure your first page of search results are the strongest.
Make life easier for users on small screens with
smart-search features like autocomplete and
corrected misspellings.
Key Takeaway
Make sure your site search returns the
strongest results first, and implement
smart-search features like autocomplete
and spelling corrections.
Example from The Home Depot Mobile Site.
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