I've found the author of Voynich manuscript. He was Giovanni Aurispa.

[Rustandi]

Thank you marcoP for thorough explanation, you are absolutely right. That is why we need to find the keywords. 
Also as I said before I am not latin language expert, so this is where latin language expert should be involved in order to know the right words, where the sentences start and end, etc. 
I am hoping that anyone here could do that.