If you need Indonesian version, 감사합니다(gamsahamnida = terima kasih) 고마워요= ma kasih) = ) bisa mengerti perbedaannya?

The differance is the politness level! Gamsahamnida 감사함니디 is thank you in it's formal form Gomawoyo 고마워요 is thank you in the intimate politness level and can just be said Gomawo 고마워 I think that is right but im not a native speaker so you should check with one, but thats my understanding.

Selamat pagi Nindya,This particular dictionary should give you an explanation of the 2 terms. elisa.ugm.ac.id/files/suray.../Korind%20Dictionary%20final.doc