Perhaps you should try some spelling variations:
"using computational method comparison program" » "using computational methods comparison program" (Expand search), "using computational model comparison program" (Expand search), "using computational models comparison program" (Expand search), "and computational method comparison program" (Expand search), "using computational method comparison from" (Expand search), "using computational intermethod comparison program" (Expand search)
"using codes from python programming" » "using code from python programming" (Expand search), "using anodes from python programming" (Expand search), "using cone from python programming" (Expand search), "using codes from pathogen programming" (Expand search), "using codes from anthony programming" (Expand search), "using cestodes from 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: "((\"using computational method comparison program\") OR (\"using codes from python programming\"))~".
• Removing quotes may allow a broader search: (( using computational method comparison program ) OR ( using codes from python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational method comparison program") OR ("using codes from python programming"))*.