Perhaps you should try some spelling variations:
"using computation using reference method" » "using computational using reference method" (Expand search), "using imputation using reference method" (Expand search), "using compilation using reference method" (Expand search), "using computations using reference method" (Expand search), "using computation in reference method" (Expand search), "using composition using reference method" (Expand search), "using computation using difference method" (Expand search), "using computation using differences method" (Expand search), "using computation using difference methods" (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 computation using reference method") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computation using reference method\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( using computation using reference method ) OR ( using coding python python programming ))*.