Perhaps you should try some spelling variations:
"coder coder sampling tree problem" » "coder under sampling tree problem" (Expand search), "coder over sampling tree problem" (Expand search), "coder core sampling tree problem" (Expand search), "coder coder sampling free problem" (Expand search), "coder coder sampling time problem" (Expand search), "coder coder sampling area problem" (Expand search), "coder coder sampling the problem" (Expand search), "coder decoder sampling tree problem" (Expand search), "code code sampling tree problem" (Expand search), "decoder codec sampling tree problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa 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 tree problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sampling tree problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder sampling tree problem ) OR ( api python python python programming ))*.