Dear Stata users,

I find an annoying problem recently. I search packages and Stata returns nothing, but these packages are just stored at SSC and can be installed sucessfully by typing ssc install packagename.
Code:
search survwgt, all
ssc describe survwgt

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package survwgt from http://fmwww.bc.edu/repec/bocode/s
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TITLE
      'SURVWGT': module to create and manipulate survey weights

DESCRIPTION/AUTHOR(S)
      
      survwgt creates sets of weights for replication-based variance
      estimation techniques for survey data.  These include balanced
      repeated replication (BRR) and several version of the survey
      jackknife (JK*).  These replication methods are alternates to the
      Taylor series linearization methods used by Stata's svy-based
      commands.
      
      KW: raking
      KW: survey weights
      KW: replication
      KW: variance estimation
      
      Requires: Stata version 7.0
      
      
      Author: Nick Winter,  University of Virginia
      Support: email nwinter@virginia.edu
      
      Distribution-Date: 20180211
      

INSTALLATION FILES                              (type net install survwgt)
      survwgt.ado
      survwgt.sthlp
      ../b/brr_hadamardmatrixfile.ado
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(type ssc install survwgt to install)
Array