Android App for Mathematics documents ?

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http://androidforums.com – I am a mathematics teacher. I use MS word on my desktop PC to type all my math expressions with all those Greek symbols - vectors, matrices,determinants,differentials, integrals etc. I am looking to buy a tablet or a smart phone. Can some one tell whether there is any app in Android that can help me to type complex math expressions & equations with ease, as in MS Word ? I have been researching on this for the last many days. Any help is appreciated. PS: Tried KingSoft Office - it does not have the capability to handle math. Thanks (General)