It depends a bit on what you are trying to accomplish, and that is not very well stated. Additionally, MS-Word does not play nice with anyone else. I wold suggest that you think about using OpenOffice (or LibreOffice) which has extensions that will make your life much easier.
In the meantime, have a gander at this: http://dpcarlisle.blogspot.com/2007/04/xhtml-and-mathml-from-office-20007.html Using MathJax from Moodle you can in fact displaty MathML with no problem.
Mathematics tools
Paste math symbols into Moodle
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