Sitelinks search Box
Google sitelinks search box make your content to reach people immediately from search results. Search users can type the URL and brand name only when they are more detailed about query site.
Google Webmaster has given below the statement when sitelinks search box is not displaying.
Nositelinks search box
Google enables to control the search box within Google’s search results. When we do not want sitelinks search box for the brand name, then can disable the option. A Meta tag is given below available to disable the sitelinks search box.
The meta tag is:
<meta name=””google”” content=””nositelinkssearchbox””>
Adding this meta tag we tell Google not to display the search box when the site appears in the search results. The sitelinks search box will be disabled, which can take few weeks to process depending on the site and other factors.