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 sampling program" » "an introduction to labeling program" (Expand search), "an introduction to smoking program" (Expand search), "an introduction to jumping program" (Expand search), "an introduction two sampling program" (Expand search), "an introduction _ sampling program" (Expand search), "an introduction by sampling program" (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: (("an introduction to sampling program") OR ("based computational python computer program"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"an introduction to sampling program\") OR (\"based computational python computer program\"))*".
• Removing quotes may allow a broader search: (( an introduction to sampling program ) OR ( based computational python computer program ))*.