Perhaps you should try some spelling variations:
"coder and coverage basis function" » "coder and coverage based function" (Expand search), "coder and coverage bags function" (Expand search), "coder and coverage brazil function" (Expand search), "coder and coverage basis functions" (Expand search), "coder and cover basis function" (Expand search), "code and coverage basis function" (Expand search), "codes and coverage basis function" (Expand search), "poder and coverage basis function" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python python python programming" (Expand search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("coder and coverage basis function") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder and coverage basis function\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder and coverage basis function ) OR ( api python python python programming ))*.