Search in contacts is limited to first name / last name and possibly nickname (when list configured by nickname).
A way to search the other fields.

https://maemo.org/community/brainsto...on_all_fields/
or
http://maemo.org/community/brainstor...on_all_fields/

I strongly favour solution #1 (KISS, ctrl-f for a full-text search)

(Edited to add http link for people not logged in into maemo.org)

Hi, I'm triyng to open the link to see the solution but I can't. Could you send it to this e.mail? jpeg1970@gmail.com
many tank for your help

If you don't have a maemo.org account (which is separate from a talk.maemo.org account) or are not logged in, you need to go to the http (instead of https) version:

http://maemo.org/community/brainstor...on_all_fields/

There is a brainstorm for this already, please vote here http://maemo.org/community/brainstor...emo_5_devices/
You may also want to take a look at this thread http://talk.maemo.org/showthread.php?t=37020

Thanks for the pointer; the brainstorm you point me to is for a bigger feature that would indeed also (as a subfeature) solve the current brainstorm. But fulltext search only in the contacts is a faster-to-implement feature that would be valuable to have in itself even if we don't get our wish for a system-wide search.

That's always good to have just one general brainstorm where certain solutions can be added.