[RenatoMN]

You will need to create a Plugin.

Product: vBulletin
Name: Hide Content From Bots
Hook: showthread_start
Execution order: 5

PHP Code:

// bots list ([] = add a new item in the end of an array)
$hide_content_agent_list[] = "GoogleBot";
$hide_content_agent_list[] = "Mediapartners-Google";
$hide_content_agent_list[] = "ad more...";

// get the user agent
$hide_content_useragent = $_SERVER['HTTP_USER_AGENT'];

// the default is true, false for bots (<else />)
$show_for_humans = true;

foreach($hide_content_agent_list as $hcag) {
    if (preg_match("/$hcag/i", "$hide_content_useragent")) {
        $show_for_humans = false;
        break;
    }
} 


Plugin is active: Yes //do not forget it

Then use the condition either this:

<if condition="$show_for_humans">
code to be show only for humans
</if>

<if condition="$show_for_humans">
code to be show only for humans
<else />
the replacement text for bots
</if>