adding unusual unicode characters in Word

[bob8594]

Hello,
I work for a project producing a documentary edition of the papers of one of the Founding Fathers, and some of the texts are in Latin and have odd characters. I'm trying to add them to our Word files (we've been using Word for our edition), but they only show up as those damn empty rectangles.
Some characters I'm trying to add: a751, a750, and 204a. I can't remember what all I've tried, though I do know I've tried changing the font to something that really should work with unicode (like Arial; I only have the fonts that come with Word 2013, though) and using the character addition box that comes up when hitting Alt+. These characters aren't already in the Special Characters boxes in Word, too bad.


I've asked the tech guys at our university, but they don't know why they're not appearing, either.
Is there a new font I need to install to make these characters appear, or is there a special process for adding them? Any help greatly appreciated.
Bob (not a techie but I can follow instructions)

PS I think the first two are in Latin Extended-D Unicode Block, if that helps.