Can you do this impossibly difficult math puzzle for 8-year-olds or are you as stupid as me?

Can you do this impossibly difficult math puzzle for 8-year-olds or are you as stupid as me?
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Vietnamese teachers and parents who are at least as dumb as I am have been totally overwhelmed by this math problem for third graders.

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I'd like to buy a vowel. (via)

8-year-old students in the town of Bao Loc, Vietnam, were given the above math problem, which has stumped teachers and parents alike. It even stumped me, and I know my times table all the way up to 6.

The solution requires only basic arithmetic and involves placing digits 1 through 9 in each blank space so that the puzzle solves for 66, which seems simple. But it's actually really hard and scary, and the more I think about it, the happier I am that I'm allowed to google math problems.

Teacher Tran Phuong told VN Express (translation via The Guardian): "I sent the problem for some people, including a doctorate in economics with mathematics, but they have not given the answer." Even a doctorate in economics with mathematics has not given the answer? Then why am I even trying?! I'm a humanities person who lacks a basic understanding of economics.

Here's what I came up with, but I'm not sure if it's correct:

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