Problem trying to rewrite a URL (no replies)

Hi all,

I have a problem trying to rewrite a URL.

It should be pretty straightforward but it has been taking me hours
searching.

Google indexed urls containing ";", which gets escaped to %3b:

http://hoidulich.com/index.php?action=tagged%3bid=254715%3btag=vietholiday
(the original url that works is
http://hoidulich.com/index.php?action=tagged;id=254715;tag=vietholiday)

How can I fix it?
Thank you very much.
Cao Tri.