Perhaps you should try some spelling variations:
"coder string _ complexity problem" » "coder string _ complex problem" (Expand search), "coder string _ completion problem" (Expand search), "coder string _ convexity problem" (Expand search), "cordel string _ complexity problem" (Expand search), "closed string _ complexity problem" (Expand search), "modelo string _ complexity problem" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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 string _ complexity problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder string _ complexity problem\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( coder string _ complexity problem ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder string _ complexity problem") OR ("using coding python python programming"))*.