I updated the solution from theme.
mods are
$customfieldCond = '';
$trimmedSPattern = trim($this->sPattern);
if (!(substr($trimmedSPattern, 0, 1) === '"' && substr($trimmedSPattern, strlen($trimmedSPattern)-1, 1) === '"')) {
$explodePattern = explode(' ', str_replace('+', '', str_replace('*', '', $trimmedSPattern)));
foreach ($explodePattern as $word) {
if ($word) $customfieldCond .= " OR u.s_value LIKE '%" . $word . "%'";
}
} else {
$customfieldCond .= " OR u.s_value LIKE '%" . trim($trimmedSPattern, '"') . "%'";
}