I want to retrieve at least 40 unique web-link using the API call from the DuckDuckGo search engine by searching the query . I managed to retrieve 19 items using the link, but the number is low.

this is my code that using:

public void search(String searchQuery) {
    Set<Link> result = new HashSet<>();
    try {
        Connection connection = Jsoup
                .connect("https://duckduckgo.com/html/?q=" + searchQuery)
                .timeout(ConstVal.TIME_OUT);

        Document doc = null;

        doc = connection.get();

        Elements links = doc.select(".result__a[href]");
        Set<Element> collect = links.parallelStream().collect(Collectors.toSet());
        for (Element link : collect) {

            if (result.size() >= 40)
                break;

            String temp = link.attr("href");
            if (temp.startsWith("")) {

                Link build = Link.builder()
                        .domainName(getDomainName(temp))
                        .build();

                result.add(build);
            }
        }
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

String getDomainName(String url) {
    String domainName = "";
    Matcher matcher = Pattern.compile(DOMAIN_NAME_PATTERN).matcher(url);

    if (matcher.find()) {
        domainName = matcher.group(0).toLowerCase().trim();
    }

    return domainName;

}

please give the way to solve this task.