Perhaps you should try some spelling variations:
"using models using convex programming" » "using models using cone programming" (Expand search), "using models using computer programming" (Expand search), "using model using convex programming" (Expand search), "ising models using convex programming" (Expand search), "nursing models using convex programming" (Expand search), "using models using context programming" (Expand search), "using models 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.

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