Why Nutch returns 0 results?

[openxu]

Hi,all!
I am a newbie to Nutch.
After  installing Tomcat and Nutch,I crawled several websites. Nutch did not
report any error.
However, when I search some words, Nutch returned 0 results. I tried sevral
words, none of them had results.
Will you give me some hints?
Thanks in advance! 
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