Perhaps you should try some spelling variations:
"coder decoder coding subsequence problem" » "coder decoder coding sequence problem" (Expand search), "coder decoder coding sequences problem" (Expand search), "coder decoder common subsequence problem" (Expand search), "coder decoder codecs subsequence problem" (Expand search), "coder decoder using subsequence problem" (Expand search), "coder decoder codec subsequence problem" (Expand search), "encoder decoder coding subsequence problem" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ 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 coding subsequence problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder decoder coding subsequence problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder decoder coding subsequence problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder decoder coding subsequence problem") OR ("on python python python programming"))*.