Perhaps you should try some spelling variations:
"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)
"coder coder sample of problems" » "coder modern sample of problems" (Expand search), "coder cover samples of problems" (Expand search), "coder code samples of problems" (Expand search), "coder decoder sample of problems" (Expand search), "code code sample of problems" (Expand search), "decoder codec sample of problems" (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 coder sample of problems") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sample of problems\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder sample of problems ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder sample of problems") OR ("on python python python programming"))*.