Help needed in ‘OmniPage 17 Pro’

Hi,
In order to convert tons of mathematics and physics documents to PDF for my students, I have purchased ‘Omnipage 17 Pro’.
I am facing a problem which is, ‘Omnipage’ is not showing most of the symbols in the documents.
When I want to edit those symbols, it is making me mad.
All documents are having lot of symbols and it will take a lot of time to edit.
So I am looking for help to add character set in ‘Omnipage’, when the symbols are not available in the default character set.
Please help me to get out of this problem.
Thanks in advance for all the support.
Casteel
