Perhaps you should try some spelling variations:
"coder coder sampling used problem" » "coder under sampling used problem" (Expand search), "coder over sampling used problem" (Expand search), "coder core sampling used problem" (Expand search), "coder coder sampling based problem" (Expand search), "coder coder sampling using problem" (Expand search), "coder coder sampling under problem" (Expand search), "coder coder sampling user problem" (Expand search), "coder coder sampling posed problem" (Expand search), "coder decoder sampling used problem" (Expand search), "code code sampling used problem" (Expand search), "decoder codec sampling used 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 coder sampling used problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sampling used problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder sampling used problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder sampling used problem") OR ("on python python python programming"))*.