Perhaps you should try some spelling variations:
"coder coder the challenges problem" » "coder coder the challenging problem" (Expand search), "coder coder the challenges profile" (Expand search), "coder coder the challenges promises" (Expand search), "coder decoder the challenges problem" (Expand search), "code code the challenges problem" (Expand search), "decoder codec the challenges problem" (Expand search), "coder code the challenges problem" (Expand search), "coder cover the challenges problem" (Expand search), "coder poder the challenges 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 the challenges problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder the challenges problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder the challenges problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder the challenges problem") OR ("_ python python python programming"))*.