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