Hi,
Thank you very much for the translation, you are awesome! I will keep adding the translatable string as much as possible. Some of them are not possible to add, but I will do my best.
As for the issue. Somewhere that string must match that result, otherwise it would not show up. It does not neccessarily have to be the SKU, it can be within the content, taxonomy, excerpt or any other selected custom field.
Try turning off these on the General Options -> sources 1 panel temporarily, to see if it still matches. You may find then which field was matching that phrase.