Perhaps you should try some spelling variations:
"coder coder triangular and problem" » "coder poder triangular and problem" (Expand search), "coder lower triangular and problem" (Expand search), "coder node triangular and problem" (Expand search), "coder coder triangular _ problem" (Expand search), "coder coder triangulare jacq problem" (Expand search), "coder decoder triangular and problem" (Expand search), "code code triangular and problem" (Expand search), "decoder codec triangular and problem" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons 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: (("coder coder triangular and problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder triangular and problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder triangular and problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder triangular and problem") OR ("_ python python python programming"))*.