Perhaps you should try some spelling variations:
"using computations using complex program" » "using computational using complex program" (Expand search), "using computacional using complex program" (Expand search), "using imputation using complex program" (Expand search), "using computation using complex program" (Expand search), "using populations using complex program" (Expand search), "using computations in complex program" (Expand search), "using computations using simplex program" (Expand search), "using computations using complex programmes" (Expand search), "using computations using complex prograded" (Expand search), "using computations housing complex program" (Expand search), "using computations using computer program" (Expand search)
"using modeling vpython python programming" » "using modeling method python programming" (Expand search), "using model vpython python programming" (Expand search), "using modern vpython python programming" (Expand search), "using models vpython python programming" (Expand search), "using modeling python python programming" (Expand search), "using modeling pythons python programming" (Expand search), "using modeling piton 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 computations using complex program") OR ("using modeling vpython python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computations using complex program\") OR (\"using modeling vpython python programming\"))".
• Removing quotes may allow a broader search: (( using computations using complex program ) OR ( using modeling vpython python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computations using complex program") OR ("using modeling vpython python programming"))*.