utf-8 search don't work properly

Thursday 08 September 2005 4:11:20 pm

I have been upgraded my site from ez 3.6.0 to 3.7.0rc1. My site supports two languages (vie-VN, vietnamese and eng-GB).
After upgrading, all search with "non-alphabetical characters" will result nothing.
Should I do about ini settings, locale, transformations, translations, database, ...