Perhaps you should try some spelling variations:
"using computations using linear programming" » "using computational using linear programming" (Expand search), "using computacional using linear programming" (Expand search), "using imputation using linear programming" (Expand search), "using computation using linear programming" (Expand search), "using populations using linear programming" (Expand search), "using computations in linear programming" (Expand search)
"using code from python programming" » "using code from pathogen programming" (Expand search), "using code from anthony programming" (Expand search), "using cone from python programming" (Expand search), "using co from python programming" (Expand search), "using co2 from python programming" (Expand search), "using code form 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 computations using linear programming") OR ("using code from python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computations using linear programming\") OR (\"using code from python programming\"))".
• Removing quotes may allow a broader search: (( using computations using linear programming ) OR ( using code from python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computations using linear programming") OR ("using code from python programming"))*.