Google Scholar is a useful way to start a search of academic literature, particularly for subject areas for which you have limited or no access to the relevant databases. Google Scholar has indexed an impressive number of academic articles; a 2014 study estimated that it contained just under 100 million English-language academic documents.
Google Scholar uses the same search syntax as Google. Searches can also be limited by author (e.g. Author:Tredwell), name of publication, and publication date. You can also limit search results to those that have links to the full text of the paper.
Although the majority of references in Google Scholar are just to citation information, where available it includes links to the full text of papers. If you are trying to find a specific paper that someone has cited, Google Scholar is a good place to start looking.