Doing online research
Everyone, including myself, usually searches through multiple sources for data and scientific studies. But most people usually search only keywords or ask the search engine questions in a sentence form, which is quite inefficient.
Google Scholar is by far one of the most popular open search engines for scientific journals and provides many options you can use to specify your query. Try it yourself.
The full version by Josh Caton is a really nice mashup on how to search in google scholar and beyond.
Take a look!