[lammps-users] search in mailing list

I’d like to search threads concering to a certain topic (e.g. thermal conductivity) in mailing list.
I tried it using “search section” in mailing list (http://sourceforge.net/search/?group_id=149493&type_of_search=mlists) after filling “thermal” and “2010.1~2010.9” in query section and search date period section respectively.

However, it doesn’t show any result.
What’s wrong with it and what should I do for it in detail?
Thanks a lot in advance.

Best regards,