Embeddings API and Support of Greek Language

Recently I have been playing with embeddings API.
I am trying to explore if I can use it with Greek Language and specifically I am converting Greek Laws to embeddings and use openai.ChatCompletion to create an ask-a-question system.
I am following exactly this example: Question_answering_using_embeddings.ipynb

The results are very disappointing… and I am trying to understand why? Am I missing something?
Can I get more information or documentation on how to embed Greek Langauge? Maybe it is not supported? What do you consult me to do to debug more the issue?
Thank you a lot,