Perhaps you should try some spelling variations:
"coder and complexity model problems" » "coder and complexity and problems" (Expand search), "coder and complexity based problems" (Expand search), "coder and complexity moral problems" (Expand search), "coder and complexity del problema" (Expand search), "coder and complexity oral problems" (Expand search), "code and complexity model problems" (Expand search), "codes and complexity model problems" (Expand search), "poder and complexity model 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 and complexity model problems\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder and complexity model problems ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder and complexity model problems") OR ("api python python python programming"))*.