wordpress: custom query with multiple categories for Visual Composer post grid in Word Press

I am using WordPress for my website.
For my publications I have:
– the category = "smiles"
– custom taxonomy = "country"

The custom taxonomy "country" has the values ​​"syria", "turkey", "kenya".

I am using Post Grid module of Visual Composer. Allows you to create a custom query in "one line" format, like posts_per_page = 3 & post_type = post & post_status = post & orderby = date & order = DESC

THE QUESTION

What is the one line query to generate posts that have BOTH category name = "smiles" AND category_name = "syria"?