Perhaps you should try some spelling variations:
"coder coder on complexity problem" » "coder coder on complex problem" (Expand search), "coder coder on completion problem" (Expand search), "coder coder on convexity problem" (Expand search), "coder coder and complexity problem" (Expand search), "coder coder _ complexity problem" (Expand search), "coder decoder on complexity problem" (Expand search), "code code on complexity problem" (Expand search), "decoder codec on complexity problem" (Expand search), "coder code on complexity problem" (Expand search), "coder codes on complexity problem" (Expand search), "coder powder on complexity 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)

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 on complexity problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder on complexity problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder on complexity problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder on complexity problem") OR ("api python python python programming"))*.