Perhaps you should try some spelling variations:
"using computation using reference array" » "using computational using reference array" (Expand search), "using imputation using reference array" (Expand search), "using compilation using reference array" (Expand search), "using computations using reference array" (Expand search), "using computation in reference array" (Expand search), "using composition using reference array" (Expand search), "using computation using reference area" (Expand search), "using computation using reference areas" (Expand search), "using computation using reference cardiac" (Expand search)
"using in python python programming" » "using in pythons python programming" (Expand search), "using in piton python programming" (Expand search), "using in pitons python programming" (Expand search), "using _ 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 array") OR ("using in python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computation using reference array\") OR (\"using in python python programming\"))".
• Removing quotes may allow a broader search: (( using computation using reference array ) OR ( using in python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computation using reference array") OR ("using in python python programming"))*.