The subsetting code used for the Google Font Directory performs the Vietnamese subsetting by pulling in the range U+1EA0..U+1EF2 (82 codepoints), plus U+20AB from the currency block:
http://code.google.com/p/googlefontdirectory/source/browse/tools/subset/subset.py
Lines: 181 if 'vietnamese' in subset: 182 result += range(0x1ea0, 0x1ef2) + [0x20ab]
The subsetting code used for the Google Font Directory performs the Vietnamese subsetting by pulling in the range U+1EA0..U+1EF2 (82 codepoints), plus U+20AB from the currency block:
http:// code.google. com/p/googlefon tdirectory/ source/ browse/ tools/subset/ subset. py
Lines:
181 if 'vietnamese' in subset:
182 result += range(0x1ea0, 0x1ef2) + [0x20ab]