There is absolutely not a shadow of a doubt that the Greeks knew all about Indian philosophy.
Source, in full
The Forgetfulness of India. Quoted in Gautier, Francois Arise again, 6 India! Har-Anand Publication 2000 p.22 Quoted from Londhe, S. (2008). A tribute to Hinduism: Thoughts and wisdom spanning continents and time about India and her culture