Perhaps you should try some spelling variations:
"coder decoder mapping from problem" » "coder cover mapping from problem" (Expand search), "coder code mapping from problem" (Expand search), "coder decoders hamming from problem" (Expand search), "encoder decoder mapping from problem" (Expand search), "coder decoder mapping from protium" (Expand search)
"in python python python programming" » "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in pitons python python programming" (Expand search), "_ python 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 decoder mapping from problem") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder decoder mapping from problem\") OR (\"in python python python programming\"))".
• Removing quotes may allow a broader search: (( coder decoder mapping from problem ) OR ( in python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder decoder mapping from problem") OR ("in python python python programming"))*.