If you dont look the other in the eye when you "nazdrave'" its a sign of disrespect.
Zdrave' is Hi. kaksi is "how are you". kaksi kazvash is "what is your name". kazvam se is "I am...(your name)". az sum is "I am". Dobre' means good/fine/well etc, or mnogo dobre' is "very good/fine etc. Malko/a means small, golyamo/a means big. I speak a little Bulgarian and believe me its much appreciated if you make the effort as i discovered when i went to Boro in Jan.