Perhaps you should try some spelling variations:
"coder implementation on strings problem" » "code implementation on strings problem" (Expand search), "decoder implementation on strings problem" (Expand search), "model implementation on strings problem" (Expand search), "coder implementation of strings problem" (Expand search), "coder implementation in strings problem" (Expand search), "coder implementation and strings problem" (Expand search), "coder implementation on string problem" (Expand search), "coder implementation on waring's problem" (Expand search), "coder implementation on sharing problem" (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 implementation on strings problem") OR ("python coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder implementation on strings problem\") OR (\"python coding python python programming\"))".
• Removing quotes may allow a broader search: (( coder implementation on strings problem ) OR ( python coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder implementation on strings problem") OR ("python coding python python programming"))*.