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