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