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