Perhaps you should try some spelling variations:
"coder coder challenge open problems" » "coder tower challenge open problems" (Expand search), "coder under challenge open problems" (Expand search), "coder elders challenge open problems" (Expand search), "coder coder challenge on problems" (Expand search), "coder coder challenge ten problems" (Expand search), "coder coder challenge coping problems" (Expand search), "coder decoder challenge open problems" (Expand search), "code code challenge open problems" (Expand search), "decoder codec challenge open problems" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder challenge open problems\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder challenge open problems ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder challenge open problems") OR ("api python python python programming"))*.