If I do a search for "Bartholomew's day massacre" from https://books.google.com/ngrams, I get to https://books.google.com/ngrams/graph?content=Bartholomew%27s+day+massacre&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2CBartholomew%20%27s%20day%20massacre%3B%2Cc0. If I copy that into my web browser, I am told

No valid ngrams to plot!
Ngrams not found: Bartholomew 's day massacre, [Bartholomew 's day massacre]

How can I avoid this?


After some testing, the following works:


It appears you need to remove the direct_url parameter. Actually, your original link works. You just have to select the text box and press Enter. This might be a temporary bug.

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