It seems you're looking for the textbook (Grammar & Vocabulary) and mentioning VK (VKontakte, the Russian social network) and "deep text" — possibly meaning a deep search, text version, or PDF link.
It seems you're looking for the textbook (Grammar & Vocabulary) and mentioning VK (VKontakte, the Russian social network) and "deep text" — possibly meaning a deep search, text version, or PDF link.