To access only scholarly articles, you should check the "peer-reviewed" option in databases.
To receive only full-text articles, check the "full-text" option (Full-text means the full article is immediately available. If you don't choose full-text articles, you may only receive a citation or abstract of an article.)
You may want to adjust the date range and only search for articles within the last 5-10 years. This is especially important for science and technology-related topics.