public function searchAdvanced()
    {
        if (!$this->nextPage) {
            Yii::$app->session->set('forum-search', [
                'query' => $this->query,
                'match' => $this->match,
                'author' => $this->author,
                'dateFrom' => $this->dateFrom,
                'dateFromStamp' => $this->dateFromStamp,
                'dateTo' => $this->dateTo,
                'dateToStamp' => $this->dateToStamp,
                'forums' => $this->forums,
                'type' => $this->type,
                'display' => $this->display
            ]);
        }
        if ($this->type == 'topics') {
            return $this->searchTopics();
        }
        return $this->searchPosts();
    }