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