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