need some help to setup nslookup

[Choi Jason]

Hello All,

I think I need your help at this time. :)
Now, I tried to use nslookup on my target system.
When I compiled busybox, I just turned on Networking Utilities -> nslookup.
And I install this busybox to my target.
And I create /etc/resolv.conf.
Contents of /etc/resolv.conf is as followings
----------------
search abc.net
nameserver 4.2.2.1
----------------
And I create /etc/hosts as followings
----------------
127.0.0.1            localhost
192.168.6.77        abc.site  abc
209.131.36.158      www.yahoo.com
----------------

When I tried "nslookup www.google.com", following message is displayed.
----------------
# nslookup www.google.com
Server    : 4.2.2.1
Address 1: 4.2.2.1

nslookup: can't resolve 'www.google.com'
----------------
And when I tried "nslookup www.yahoo.com", following message is displayed.
----------------
#nslookup www.yshoo.com
Server:     4.2.2.1
Address 1: 4.2.2.1

Name:       www.yahoo.com
Address 1: 209.131.36.158 www.yahoo.com
-----------------

So,,I don't know why I could not get address resolve result.
Do I need more steps to setup nslookup on my target?

I think when I tried address resolve of www.yahoo.com, it could find it's 
result thanks to /etc/hosts.

I hope to get some help from you guys.
Thanks in advance :)

                          Jason,