"Google Correlate finds search patterns which correspond with real-world trends.
Compare time series
Many search terms vary in popularity over time. To find terms that vary in a similar way to your own time series, enter your data using the link above. Or take a look at these examples to see which search terms: "
"This website provides an introduction to digital collections designed for education. They are mainly aimed at university students, researchers and librarians but many of the online archives are open to anyone. The collections cover areas such as history, social sciences, or science and engineering and include, for example, journals, newspapers and images."