Perhaps you should try some spelling variations:
"and computational using linear programming" » "and computation using linear programming" (Expand search), "and computations using linear programming" (Expand search), "and computacional usinas linear programming" (Expand search), "_ computational using linear programming" (Expand search)
"using codigo python python programming" » "using codigo pythons python programming" (Expand search), "using codigo piton python programming" (Expand search), "using codigo pitons python programming" (Expand search), "using indigo python python programming" (Expand search), "using coding python python programming" (Expand search), "using codium 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: (("and computational using linear programming") OR ("using codigo python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computational using linear programming\") OR (\"using codigo python python programming\"))*".
• Removing quotes may allow a broader search: (( and computational using linear programming ) OR ( using codigo python python programming ))*.