Hi. I'm not sure what you mean ... do you want to develop a Vietnamese
interface to Greenstone? If so, that would be fantastic. We are just
finalizing a new interface for language translators to create new
translations and update old ones. Get in touch with Katrina Edgar
<kde2@waikato.ac.nz> who will show you where it is, how to use it and
help you with any problems.

If not, please could you be more explicit about what you are seeking to
do?

cheers
ian