Should we use quotation marks for Smart Searches?

If we don't use quotation marks around search strings for Smart Searches, a card showing a Factbook entry and links to My Documents appears in the results (if I do use quotation marks, I don't get the card)

While the Factbook article and the docs are related - it seems only at the level of matching one of the words with no Smart Analysis applied.

Is this expected or should we use quotation marks around the search string?

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