Perhaps you should try some spelling variations:
"coder coder robot walking problem" » "coder coder robot walking problems" (Expand search), "coder coder robot packing problem" (Expand search), "coder coder robot halting problem" (Expand search), "coder coder robot welding problem" (Expand search), "coder decoder robot walking problem" (Expand search), "code code robot walking problem" (Expand search), "decoder codec robot walking problem" (Expand search), "coder clever robot walking problem" (Expand search), "coder soccer robot walking 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 robot walking problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder robot walking problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder robot walking problem ) OR ( api python python python programming ))*.