Thanks for your query.Based on the facts that you have posted it appears that your husband has undergone Vasectomy Reversal
surgery 6 months back .
The operating surgeon had difficulty in findings the ends of the tubes ligated at original surgery of vasectomy done 11 years back.
Normally anti sperm anybodies are produced in body after vasectomy which kill the sperms produced by testicles ,
It is very difficult to predict regarding the return of sperms in semen after vasectomy reversal as it depends entirely upon the level of anti sperm antibodies
in his blood and results of vasectomy reversal are guarded and can not be assured by any surgeon neither it depends upon his skill.
If you are too curious to know about the results please get his blood test
for Anti-sperm antibodies done .
Hope I have answered your query.