Perhaps you should try some spelling variations:
"coder coder triangular wave program" » "coder poder triangular wave program" (Expand search), "coder lower triangular wave program" (Expand search), "coder node triangular wave program" (Expand search), "coder coder triangular love program" (Expand search), "coder coder triangular trade program" (Expand search), "coder coder triangular tube program" (Expand search), "coder coder triangular aware program" (Expand search), "coder coder triangular brave program" (Expand search), "coder coder triangular care program" (Expand search), "coder decoder triangular wave program" (Expand search), "code code triangular wave program" (Expand search), "decoder codec triangular wave program" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ python programming" (Expand search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder triangular wave program") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder triangular wave program\") OR (\"on python python python programming\"))".
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• Adding a wildcard symbol may retrieve word variants: (("coder coder triangular wave program") OR ("on python python python programming"))*.