Perhaps you should try some spelling variations:
"using computation in computer program" » "using computational in computer program" (Expand search), "using imputation in computer program" (Expand search), "using compilation in computer program" (Expand search), "using computation and computer program" (Expand search), "using computation of computer program" (Expand search), "using computation _ computer program" (Expand search)
"using coding geant4 python programming" » "using codigo geant4 python programming" (Expand search), "using coding genes python programming" (Expand search), "using coding gene python programming" (Expand search), "using coding gate python programming" (Expand search), "using coping geant4 python programming" (Expand search), "using coating geant4 python programming" (Expand search), "using cooking geant4 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 computation in computer program") OR ("using coding geant4 python programming"))~.
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• Removing quotes may allow a broader search: (( using computation in computer program ) OR ( using coding geant4 python programming ))*.