Perhaps you should try some spelling variations:
"using perturbation with precoder program" » "in perturbation with precoder program" (Expand search), "packing perturbation with precoder program" (Expand search), "and perturbation with precoder program" (Expand search), "using perturbations with precoder program" (Expand search), "using perturbation in precoder program" (Expand search), "using perturbation to precoder program" (Expand search), "using perturbation with proder program" (Expand search), "using perturbation with recovery program" (Expand search), "using perturbation with precoce programa" (Expand search), "using perturbation with precoding program" (Expand search), "using perturbation with prader program" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("using perturbation with precoder program") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using perturbation with precoder program\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( using perturbation with precoder program ) OR ( using coding python python programming ))*.