Perhaps you should try some spelling variations:
"coder decoder robot programming problems" » "coder decoder robots programming problems" (Expand search), "coder decoder goal programming problems" (Expand search), "coder decoder cone programming problems" (Expand search), "encoder decoder robot programming problems" (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 robot programming problems") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder decoder robot programming problems\") OR (\"in python python python programming\"))".
• Removing quotes may allow a broader search: (( coder decoder robot programming problems ) OR ( in python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder decoder robot programming problems") OR ("in python python python programming"))*.