Many databases have limiters to help you refine results. Many databases have filters for:
Some databases will also have limiters for language, methodology, geography, etc. The available filters will depend on the specific database.
You can specify where the database should look for your terms. For example, you can specify that terms should be present in say the title, abstract, etc. Different databases may have different field options.
It's always best to email and / or download articles that you find to ensure that you can access them later. Many database have tools for emailing articles.
To download articles, look for the PDF icon.
Many databases also have tools to help you cite articles, but these are not 100 percent accurate. Copy / paste citations into your word processor, and make sure to edit them.