Perhaps you should try some spelling variations:
"coder string on complexity problem" » "coder string on complex problem" (Expand search), "coder string on completion problem" (Expand search), "coder string on convexity problem" (Expand search), "coder string and complexity problem" (Expand search), "coder string _ complexity problem" (Expand search), "cordel string on complexity problem" (Expand search), "closed string on complexity problem" (Expand search), "modelo string on complexity problem" (Expand search), "coder strings on complexity problem" (Expand search), "coder string in complexity problem" (Expand search), "coder string of 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.

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