Perhaps you should try some spelling variations:
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"sampling error python python programming" » "sampling effort python python programming" (Expand search), "sampling error pythons python programming" (Expand search), "sampling error piton python programming" (Expand search), "sampling error pitons python programming" (Expand search), "sampling error method 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 coding python and programming") OR ("sampling error python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coding python and programming\") OR (\"sampling error python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coding python and programming ) OR ( sampling error python python programming ))*.