Google
Google Advanced Search
Offers a variety of ways to structure a more precise search and improve the efficiency of your search results.
For example:
women revolution nicaragua* site:.edu
Google Scholar
Google's scholarly search engine. Google Scholar searches for scholarly materials including journal articles, theses, books, preprints, abstracts and technical reports from a variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web.
Google Scholar is especially useful when doing a quick search on a topic but less useful when you want an overview of literature on a certain topic,
For the pros and cons of searching Google Scholar, check this guide from ECU Libraries.
TIP: By search Google Scholar through the Queen's Library website, the "Get it @ Queen's: citation linker is activated, which allows you to click through to the Library's subscription.
Academia.edu
Academia is a platform for sharing academic research. Papers on Academia are free to read and download. All you need is an Academia account to download.