Perhaps you should try some spelling variations:
"coder coder on strings problem" » "coder coder on string problem" (Expand search), "coder coder on waring's problem" (Expand search), "coder coder on sharing problem" (Expand search), "coder decoder on strings problem" (Expand search), "code code on strings problem" (Expand search), "decoder codec on strings problem" (Expand search), "coder coder of strings problem" (Expand search), "coder coder in strings problem" (Expand search), "coder code on strings problem" (Expand search), "coder codes on strings problem" (Expand search), "coder powder on strings 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 strings problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder on strings problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder on strings problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder on strings problem") OR ("api python python python programming"))*.