Perhaps you should try some spelling variations:
"coder coder _ challenges on" » "coder coder _ challenges of" (Expand search), "coder coder _ challenges in" (Expand search), "coder coder _ challenges and" (Expand search), "coder decoder _ challenges on" (Expand search), "code code _ challenges on" (Expand search), "decoder codec _ challenges on" (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 _ challenges on") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder _ challenges on\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder _ challenges on ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder _ challenges on") OR ("api python python python programming"))*.