Perhaps you should try some spelling variations:
"coder coder base sample problem" » "coder coder base complex problem" (Expand search), "coder coder base scale problem" (Expand search), "coder decoder base sample problem" (Expand search), "code code base sample problem" (Expand search), "decoder codec base sample problem" (Expand search), "coder coder based sample problem" (Expand search), "coder coder based samples problem" (Expand search), "coder coder biased sample problem" (Expand search), "coder copper base sample problem" (Expand search), "coder poder bases sample problem" (Expand search), "coder foder based sample problem" (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 base sample problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder base sample problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder base sample problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder base sample problem") OR ("_ python python python programming"))*.