Perhaps you should try some spelling variations:
"using approximation using convex programming" » "ring approximation using convex programming" (Expand search), "using approximate using convex programming" (Expand search), "point approximation using convex programming" (Expand search), "using approximation in convex programming" (Expand search), "using approximation and convex programming" (Expand search), "using approximation with convex programming" (Expand search), "using approximation using cone programming" (Expand search), "using approximation using computer programming" (Expand search), "using approximation using context programming" (Expand search), "using approximation using complex programming" (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: (("using approximation using convex programming") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using approximation using convex programming\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( using approximation using convex programming ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using approximation using convex programming") OR ("using coding python python programming"))*.