How to know if which word is being searched on search engines in another nation?

1. Look at Google trend data (Google) for the keyword you're interested in finding out about and look at the relative frequency across different countries.
2. Find keyword research tools relevant to each country as an alternative way to find long tail keywords (e.g., Brandwatch).
3. Use ExploreKeyword's Keyword Volume Checker to find such keywords

How does this work? Assuming there's an interest in American English, conducting a search for "calendar" will show how many times per minute the word