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$conditions = array();
$words = preg_split( "/([ ]+|[-]+|[_]+)/", $value);
foreach( $words as $value ){
    $conditions[] = array('like' => "%{$value}%");
}

$paymentTableName = Mage::getSingleton('core/resource')->getTableName('sales/order_payment');
$this->getCollection()->addFieldToFilter(
    "{$paymentTableName}.method",
    array('like' => "%{$value}%")
);