Perhaps you should try some spelling variations:
"using computational under coding program" » "and computational under coding program" (Expand search), "using computation under coding program" (Expand search), "using computational and coding program" (Expand search), "using computational code coding program" (Expand search), "using computational under cloning program" (Expand search), "using computational under loading program" (Expand search), "using computational under cooling programs" (Expand search), "using computational under cooling program" (Expand search), "using computational under flooding program" (Expand search)
"based estimation using coding program" » "and estimation using coding program" (Expand search), "speed estimation using coding program" (Expand search), "based investigation using coding program" (Expand search), "based estimation in coding program" (Expand search), "based estimation and coding program" (Expand search), "based estimation using cloning program" (Expand search), "based estimation using loading program" (Expand search), "based estimation using cooling programs" (Expand search), "based estimation using coping program" (Expand search), "based estimation using coating program" (Expand search), "based estimation using cooking program" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computational under coding program\") OR (\"based estimation using coding program\"))~".
• Removing quotes may allow a broader search: (( using computational under coding program ) OR ( based estimation using coding program ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational under coding program") OR ("based estimation using coding program"))*.