Perhaps you should try some spelling variations:
"by computations using linear programming" » "by computation using linear programming" (Expand search), "by populations using linear programming" (Expand search), "by computations in linear programming" (Expand search), "by computational using linear programming" (Expand search), "of computations using linear programming" (Expand search), "by computacional using linear programming" (Expand search)
"using python python python programming" » "using pythons python python programming" (Expand search), "using piton python python programming" (Expand search), "using pitons python python programming" (Expand search), "usando python python python programming" (Expand search), "in python 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: (("by computations using linear programming") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"by computations using linear programming\") OR (\"using python python python programming\"))".
• Removing quotes may allow a broader search: (( by computations using linear programming ) OR ( using python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("by computations using linear programming") OR ("using python python python programming"))*.