Perhaps you should try some spelling variations:
"using propagation in coverage program" » "cutting propagation in coverage program" (Expand search), "single propagation in coverage program" (Expand search), "in propagation in coverage program" (Expand search), "using propagation in coverage problem" (Expand search), "using propagation in coverage from" (Expand search), "using propagation of coverage program" (Expand search), "using propagation and coverage 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 propagation in coverage program") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using propagation in coverage program\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( using propagation in coverage program ) OR ( using coding python python programming ))*.