为何 npm search 搜不到东西了?

D:\>npm config list
; cli configs
registry = "http://registry.npm.taobao.org/"
user-agent = "npm/1.4.28 node/v0.10.34 win32 ia32"

NPM_CONFIG_PREFIX = "0"
registry = "http://registry.npm.taobao.org/"

; node bin location = C:\Program Files\nodejs\\node.exe
; cwd = D:\
; 'npm config ls -l' to show all defaults.


D:\>npm search mongo
No match found for "mongo"


http://npm.taobao.org/browse/keyword/mongo
在站点是可以搜到东西的啊?