Perhaps you should try some spelling variations:
"and computations using linear programming" » "and computation using linear programming" (Expand search), "and populations using linear programming" (Expand search), "and computations in linear programming" (Expand search), "and computational using linear programming" (Expand search), "and competitions 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computations using linear programming\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( and computations using linear programming ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("and computations using linear programming") OR ("using python python python programming"))*.