Math-Type v.3 forumla editor can't draw some of the greek symbols

Hello community,

i'm using corel draw x4 on windows 8. I use the Math-Type Editor in order to create complex formulas with indices, potencies, greek letters and fraction bars.

Unfortunately Corel Draw can't depict some of the symbols for example the small theta "ϑ" or the multiplication sign. Instead of writing them it creates a blank or question marks.

Is there a way to create those symbols in the Math-Type Editor?

Thanks in advance,

Moritz