I do some signature in forum, and can found link:www.cn-crystal.com in yahoo, why my website not collect by google ? thanks
Yes that is perfectly normal. Sign up for a Google Webmaster account, attach an XML sitemap to your site and submit it via your new account. Google will give you back more stats about your site including those missing back links you don't see on their result pages.
To my best knowledge Yahoo Site Explorer backlinks count is constantly updated, whereas Google backlinks gets updated once in a while, i believe that twice in 3 months.
Google only show a small part of your backlink, but if you have an account of webmaster tools you can see more backlinks.
Indeed, make an account with Google's webmaster tool, from there you will be able to see all backlinks to your site (even tho, lately, for one of my sites old few months already, it still does not display backlinks )
Did use the goodgle sitempa facility recently and my new site was indexed within the hour, brilliant! Try this free facility...!
Google does not show all the backlinks but after the backlink update, it would increase. Just keep on building backlinks for you to get more.