Perhaps you should try some spelling variations:
"coder and coverage calculation function" » "coder and coverage calculations function" (Expand search), "coder and coverage manipulation function" (Expand search), "coder and average circulation function" (Expand search), "coder and coverage circulation function" (Expand search), "coder and coverage calibration function" (Expand search), "coder and coverage coagulation function" (Expand search), "coder and cover calculation function" (Expand search), "code and coverage calculation function" (Expand search), "codes and coverage calculation function" (Expand search), "poder and coverage calculation function" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons python python programming" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder and coverage calculation function\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder and coverage calculation function ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder and coverage calculation function") OR ("_ python python python programming"))*.