$select->columns(array(
                $this->getTableName() . '.*',
                "MATCH ({$this->getTableName()}.title, {$this->getTableName()}.content, {$this->getTableName()}.search_index, {$this->getTableName()}.tags) AGAINST ({$this->getAdapter()->quote($words)} IN BOOLEAN MODE) + MATCH(a.answer) AGAINST ({$this->getAdapter()->quote($words)} IN BOOLEAN MODE) AS rel"
            ))
                ->where("MATCH ({$this->getTableName()}.title, {$this->getTableName()}.content, {$this->getTableName()}.search_index, {$this->getTableName()}.tags) AGAINST ({$this->getAdapter()->quote($words)} IN BOOLEAN MODE) > 0 OR MATCH(a.answer) AGAINST ({$this->getAdapter()->quote($words)} IN BOOLEAN MODE) > 0")
                ->reset('order')
                ->order('rel DESC');