[Groff] Vietnamese letters with two diacriticals.

[Robert Marks]

I have used two Unicode characters, u1EA5 and u1EC7
in a groff document, but get messages (for the first:

warning: can't find special character `u0065_0323_0302'

and

warning: can't find special character `u0061_0302_0301'
for the second.

These special characters seem correct since the two characters are each
made up of a letter and two diacriticals.

Is there are way to get these characters into a groff document?
(GNU grops (groff) version 1.22.3, to PS before PDF).

Thanks,

Bob Marks
-- 
http://www.agsm.edu.au/bobm
0407665644