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