Perhaps you should try some spelling variations:
"using computation using modtran program" » "using computational using modtran program" (Expand search), "using imputation using modtran program" (Expand search), "using compilation using modtran program" (Expand search), "using computations using modtran program" (Expand search), "using computation in modtran program" (Expand search), "using composition using modtran program" (Expand search), "using computation using fortran program" (Expand search), "using computation using fortran programs" (Expand search), "using computation using modern program" (Expand search), "using computation using moderate program" (Expand search), "using computation using modal program" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking python 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 computation using modtran program\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( using computation using modtran program ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computation using modtran program") OR ("using coding python python programming"))*.