Perhaps you should try some spelling variations:
"coder authentication using coding problems" » "coffee authentication using coding problems" (Expand search), "user authentication using coding problems" (Expand search), "honey authentication using coding problems" (Expand search), "coder authentication in coding problems" (Expand search), "coder authentication and coding problems" (Expand search), "coder authentication of coding problems" (Expand search), "coder authentication using loading problems" (Expand search), "coder authentication using counting problems" (Expand search), "coder authentication using covering problems" (Expand search), "coder authentication using coping problems" (Expand search), "coder authentication using coating problems" (Expand search), "coder authentication using cooking 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder authentication using coding problems") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder authentication using coding problems\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder authentication using coding problems ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder authentication using coding problems") OR ("api python python python programming"))*.