Perhaps you should try some spelling variations:
"based expression using linear programming" » "and expression using linear programming" (Expand search), "based regression using linear programming" (Expand search), "fixed expressions using linear programming" (Expand search), "based expression during linear programming" (Expand search), "based expression and 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: (("based expression using linear programming") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based expression using linear programming\") OR (\"using python python python programming\"))*".
• Removing quotes may allow a broader search: (( based expression using linear programming ) OR ( using python python python programming ))*.