Perhaps you should try some spelling variations:
"using computation using linear programming" » "using computational using linear programming" (Expand search), "using imputation using linear programming" (Expand search), "using compilation using linear programming" (Expand search), "using computations using linear programming" (Expand search), "using computation in linear programming" (Expand search), "using composition using linear programming" (Expand search)
"using tools python python programming" » "using tools pythons python programming" (Expand search), "using tools piton python programming" (Expand search), "using tools pitons python programming" (Expand search), "using tool python python programming" (Expand search), "using tools person python programming" (Expand search), "cutting tools python python programming" (Expand search), "testing tools python python programming" (Expand search), "mining tools 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: (("using computation using linear programming") OR ("using tools python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computation using linear programming\") OR (\"using tools python python programming\"))*".
• Removing quotes may allow a broader search: (( using computation using linear programming ) OR ( using tools python python programming ))*.