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