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