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