Perhaps you should try some spelling variations:
"coder competition and linear programming" » "cover competition and linear programming" (Expand search), "under competition and linear programming" (Expand search), "core competition and linear programming" (Expand search), "coder competition and nonlinear programming" (Expand search)
"python coding python python programming" » "action coding python python programming" (Expand search), "python code python python programming" (Expand search), "python codigo python python programming" (Expand search), "python codigos python python programming" (Expand search), "python using python python programming" (Expand search), "python coding pythons python programming" (Expand search), "python coding piton python programming" (Expand search), "python coding pitons 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 competition and linear programming") OR ("python coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder competition and linear programming\") OR (\"python coding python python programming\"))".
• Removing quotes may allow a broader search: (( coder competition and linear programming ) OR ( python coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder competition and linear programming") OR ("python coding python python programming"))*.