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