Perhaps you should try some spelling variations:
"testing functions in linear programming" » "testing functional in linear programming" (Expand search), "iterating functions in linear programming" (Expand search), "teaching functions in linear programming" (Expand search), "testing functions non linear programming" (Expand search), "testing functions in line programming" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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: "((\"testing functions in linear programming\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( testing functions in linear programming ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("testing functions in linear programming") OR ("using coding python python programming"))*.