Perhaps you should try some spelling variations:
computation using » computations using (Expand search), computation in (Expand search), composition using (Expand search)
purchase program » purchase process (Expand search)
modeling vpython » modeling method (Expand search)
using purchase » using phase (Expand search), in purchase (Expand search), using purse (Expand search)
using modeling » using model (Expand search), using modern (Expand search), using models (Expand search)
vpython python » python python (Expand search), pythons python (Expand search), piton python (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( AND computation using purchase program ) OR ( using modeling vpython python programming ))~.