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