Perhaps you should try some spelling variations:
"coder coder primer walking problem" » "coder coder primer walking problems" (Expand search), "coder coder primer packing problem" (Expand search), "coder coder primer halting problem" (Expand search), "coder coded primary walking problem" (Expand search), "coder del primer walking problem" (Expand search), "coder after primer walking problem" (Expand search), "coder decoder primer walking problem" (Expand search), "code code primer walking problem" (Expand search), "decoder codec primer 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 primer walking problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder primer walking problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder primer walking problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder primer walking problem") OR ("api python python python programming"))*.