$html = file_get_contents('https://www.olx.ua/elektronika/tv-videotehnika/odessa/?search%5Bprivate_business%5D=private');
libxml_use_internal_errors(true);
$dom = new \DOMDocument();
$dom->loadHTML($html);
$xpath = new \DOMXPath($dom);
$elements = $xpath->query('/html/body/div[1]/div[4]/section/div[3]/div/div[1]/table[2]/tbody/tr/td/div/table/tbody/tr[1]/td[2]/div/h3/a/strong');
foreach ($elements as $title) {
echo "$title->nodeValue\n";
}