Perhaps you should try some spelling variations:
"coder case complexity open problems" » "coder the complexity open problems" (Expand search), "coder and complexity open problems" (Expand search), "coder case complexity on problems" (Expand search), "coder case complexity of problems" (Expand search), "coder case complexity in problems" (Expand search), "border case complexity open problems" (Expand search), "power case complexity open problems" (Expand search), "lower case complexity 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 case complexity open problems\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder case complexity open problems ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder case complexity open problems") OR ("api python python python programming"))*.