Perhaps you should try some spelling variations:
"coder coder sphere packing problem" » "coder coder sphere planning problem" (Expand search), "coder coder sphere packings problem" (Expand search), "coder bonner sphere packing problem" (Expand search), "coder cancer sphere packing problem" (Expand search), "coder inner sphere packing problem" (Expand search), "coder decoder sphere packing problem" (Expand search), "code code sphere packing problem" (Expand search), "decoder codec sphere packing 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 sphere packing problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sphere packing problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder sphere packing problem ) OR ( api python python python programming ))*.