Google instant search is new search feature that shows search results as you type. But if you do not want to use this feature then you can disable Google instant search using the following methods.
Selecting Instant Off using the drop down available next to the search button.
If the Instant settings drop down is not available then you can use Search settings to disable this feature.
Navigate to Settings link on the Google Search page and select Search settings from the drop down menu. In the Global Preferences, scroll down to Google Instant section and select the Do not use Google Instant radio option.