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