Google's Advanced Search options give you a lot more control over what your retrieve:  https://www.google.com/advanced_search
Among the most useful:

• this exact word or phrase
• language
• site or domain  (especially.edu for academic websites)
• usage rights
• Compare Google's cache with the Internet Archive's Wayback Machine

As you view the results of a Google search, you can use the "Tools" option (near the top of the page) to control your results by date of posting.

If you want to be notified daily via e-mail of new online references to a particular topic, you can use the Google Alerts option:  https://www.google.com/alerts

(Google account needed.)

Google Scholar "helps you find relevant work across the world of scholarly research":  https://scholar.google.com/
Please note that the results of searches: (1) include materials not accessible in full-text form; (2) are accompanied by options to control results by posting dates.

If you have a Google account, you can design your own search engines to search only the content of sites you designate.  The W&L library maintains a number of these tools:  http://libguides.wlu.edu/googletools