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 using python python programming" » "using using pythons python programming" (Expand search), "using using piton python programming" (Expand search), "using using pitons python programming" (Expand search), "using usando python python programming" (Expand search), "using in python python programming" (Expand search), "using fusing python python programming" (Expand search), "housing using python python programming" (Expand search), "nursing using 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 computations using linear programming") OR ("using using python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computations using linear programming\") OR (\"using using python python programming\"))".
• Removing quotes may allow a broader search: (( using computations using linear programming ) OR ( using using python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computations using linear programming") OR ("using using python python programming"))*.