Phone and Web search using text entry
Touch and hold the Home Key
or tap the Search Widget 
on your Home screen.Google Search will open automatically.
Voice Search
Tap here to search by voice.
Enter the text you’re searching for in the search field.
As you type, search results from your phone, previous search terms, and web search suggestions appear. Tap an item to activate that search result.
Tap the Search Key
on the on-screen
keyboard (or press the Return Key 
on the QWERTY Keyboard)
to use the Google application to search for the text you entered in
the search field.