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 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: (("based expression using linear programming") OR ("using codigo python python programming"))~.
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• Removing quotes may allow a broader search: (( based expression using linear programming ) OR ( using codigo python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("based expression using linear programming") OR ("using codigo python python programming"))*.