Google Scholar is a search engine specialised in finding research articles. Some of library's electronic resources can be searched with Google Scholar. In addition, you'll be able to search for Open Access materials.
Use Google's Advanced search to
Remember to evaluate the reliability and usability of the sources you find!
How to use search engines effectively: Google and beyond (by Bristol University Library)
Excellent for keeping up with the latest developments in your field. Look for blogs by researchers of research groups.
Social media search engines
There are specialised search engines for searching in social media. Find out more on Social Media: Guide to Searching Twitter, Facebook, Blogs, Videos, Images, etc by Cornell University Library.
Open science and research aims to make research results, research data, and research methods publicly accessible and usable. Increasingly, both research publications and research data are freely available to anyone. Research data already collected could be used in theses, for instance. Search for open data in data archives, such as the ones below.
Research data is source material like any other, such as a book, journal article or a website. The same principles apply to citing data sources. In the minimum, the citation should include author, title, publication year, version, and information on availability (permanent identifier of data). Data archives often provide citation instructions for users. If you are using open data for your thesis, it is a good idea to ask your thesis adviser for advice on citing.
More information and examples of citing data: