The Russian way to say Hello, is not the only expression you will hear around here. No site on Russian greetings would be complete without teaching how to say: Good morning, good afternoon, and good evening. These are the equivalent of Russian hello, but are used at different times of day.
The word “good” in Russian is “dobri”, but, adjectives (like “good”) have to change to agree with the noun (like “moring or day).
A lot of the times this means the words have to rhyme, but not always. Anyway, that’s why you’ll see two versions of the word “dobri” in these phrases.