Perhaps you should try some spelling variations:
"and computational python computer program" » "and computacional python computer program" (Expand search), "and computacional vpython computer program" (Expand search), "and computacionais python computer program" (Expand search), "_ computational python computer program" (Expand search)
"an introduction and pulling program" » "an introduction to pulling program" (Expand search), "an introduction of pulling program" (Expand search), "an introduction and culling program" (Expand search), "an introduction and spelling program" (Expand search), "an introduction and spelling programs" (Expand search), "an introduction and pulsing program" (Expand search), "an introduction and filling program" (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: "((\"an introduction and pulling program\") OR (\"and computational python computer program\"))~".
• Removing quotes may allow a broader search: (( an introduction and pulling program ) OR ( and computational python computer program ))~.
• Adding a wildcard symbol may retrieve word variants: (("an introduction and pulling program") OR ("and computational python computer program"))*.