Ochen' khorosho
Very good"Ь" in russian means a softening, turns, for example, a hard N from "no" into a sort high-pitched N from "new"Bol'shoe spasibo
Thank you very muchOr literally "Big thanks"Ne ploho
Not badPojaluysta
You're welcomeOr "Please"
Bol'choe is what evolved into Bolshoi (huge), the well known circus/theater name. Ne plokho places ne before plokho (bad), so it becomes a "Not..." negative sentence.