[Koha] Could not find the book by Search

Hi, Please help,I had added biblio from koha administration page and also imported data from another library system,it added successfully. While I had queried that records on command line from tables, for example from biblio table,it had also brought me records successfully. When I had tried search from koha administration page or OPAC pages, it had brought no results. Can you tell what is problem, what I did wrong or did not do. We are use koha 3 beta 2 version on Ubuntu 7.10 OS. Thank you in advance, With regards Anahit