Perhaps you should try some spelling variations:
"using imputation in computer program" » "using mutation in computer program" (Expand search), "testing imputation in computer program" (Expand search), "using computational in computer program" (Expand search), "using imputation of computer program" (Expand search), "using implantation in computer program" (Expand search), "using imputation _ computer program" (Expand search)
"using code from python programming" » "using code from pathogen programming" (Expand search), "using code from anthony programming" (Expand search), "using cone from python programming" (Expand search), "using co from python programming" (Expand search), "using co2 from python programming" (Expand search), "using code form 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: (("using imputation in computer program") OR ("using code from python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using imputation in computer program\") OR (\"using code from python programming\"))".
• Removing quotes may allow a broader search: (( using imputation in computer program ) OR ( using code from python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using imputation in computer program") OR ("using code from python programming"))*.