Perhaps you should try some spelling variations:
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"an introduction in pulling program" » "an introduction and pulling program" (Expand search), "an introduction to pulling program" (Expand search), "an introduction of pulling program" (Expand search), "an introduction in culling program" (Expand search), "an introduction in spelling program" (Expand search), "an introduction in spelling programs" (Expand search), "an introduction in pulping program" (Expand search), "an introduction oil pulling 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 in pulling program") OR ("based computational python computer programme"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"an introduction in pulling program\") OR (\"based computational python computer programme\"))*".
• Removing quotes may allow a broader search: (( an introduction in pulling program ) OR ( based computational python computer programme ))*.