Why is so difficult to find more backlinks in GG ?

I'd like to ask a question:
Why is so difficult to find more backlinks of mysite from Google Searching Engine?
The following is number of backlinks of my site from some search engines.We can find least backlinks of mysite from Google :

BAIDU: 2600
GOOGLE: 13
YAHOO: 3008

What's the reason?

 

Google only shows a sample of your backlinks.

 

Google only shows a sample to protect its algorithm from competitors like yahoo and msn.

 

Google only shows quality links. Use Google Webmaster Tools to see all backlinks.
http://www.google.com/webmasters/tools/

 

backlinks of my site
BAIDU: 1,180
GOOGLE: 3,200

 

Tks a lot.

 

Google probably has more links, but shows only a few.

 

Google only shows a random sample of your links they do this because they don't want other webmaster to spy on their competitors link.

But you can see the real number of your links in google webmaster tools.

 

Just login to your google account and check the google webmaster tools to get the real values.

 

Google only shows quality links.

 

I totally Agree. With U

 

not true, even that shows about 40-50% of your real number.

 

Keep in mind that Google has recently raised its quality threshold for indexing, so many deeply buried directory and blog pages with minuscule PageRank that might appear in Yahoo! are either relegated to the Supplemental Index or not indexed at all in Google. And like the link: operator, the data in the Webmaster Tools console is only updated periodically and may not reflect recently posted links.

 

Google is slow in terms of backlink updates.