what is the Proper korean word to say Hello.. i hard many different words saying hello like below.
Anyaseyo
anyo
so what is the correct word?
As in any language, there are lots of ways to greet people. I think the two you mean are:
Annyeong haseyo? (안녕하세요?). This literally means 'are you in peace?', but idiomatically is a polite way of saying 'hello'.
Annyeong! (안녕!). This is a more informal, shorter version. You can think of it as being the equivalent of 'Hi!'.
The shorter version, 'Annyeong!', can also be used between close friends to mean 'Bye!'. However, to say 'bye' in a more polite way, you might say
Annyeonghi Gyeseyo (안녕히 계세요) - 'stay in peace', if the other person is staying, or
Annyeonghi Gaseyo (안녕히 가세요) 'go in peace', if the other person is leaving.
I'm mentioning these as, when said fast, they can sound like 'annyeong haseyo?' - but you wouldn't use 'annyeong haseyo?' to say goodbye.