I used the following query:
SELECT TOP 20
Author,
COUNT(*) AS [Post]
FROM
TxComments
WHERE
body LIKE '%Спасибо%'
GROUP BY
Author
ORDER BY
COUNT(*) DESC
It is less efficient than using CONTAINS() or FREETEXT() but these can't be used as full text search catalog is based on English locale.
If you need more help, please use steemsql channel on steemit.chat
I did not find any word "спасибо" at linkback-bot-v0