Perhaps you should try some spelling variations:
"code complexity using string theory" » "code complexity during string theory" (Expand search), "code complexity un string theory" (Expand search), "code complexity user string theory" (Expand search), "case complexity using string theory" (Expand search), "care complexity using string theory" (Expand search), "the complexity using string theory" (Expand search), "code complexity using nursing theory" (Expand search), "code complexity using strong theory" (Expand search), "code complexity using spring theory" (Expand search), "code complexity using strains theory" (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: (("code complexity using string theory") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"code complexity using string theory\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( code complexity using string theory ) OR ( using coding python python programming ))*.