RewriteEngine On
RewriteCond %{HTTP_REFERER} https?://www.google.com/?q=*$ [NC,OR]
RewriteCond %{HTTP_REFERER} https?://www.google.com/?q=([A-Za-z0-9_-s.]+)/?$ [NC,OR]
RewriteRule ^(.*) – [F,L]

RewriteEngine On
RewriteCond %{HTTP_REFERER} https?://www.google.com/?q=(.*)$ [NC,OR]
RewriteRule ^(.*) – [F,L]