Perhaps you should try some spelling variations:
"an introduction on computers programming" » "an introduction on computer program" (Expand search), "an introduction on computer programs" (Expand search), "an introduction of computers programming" (Expand search), "an introduction in computers programming" (Expand search), "an introduction and computers programming" (Expand search), "an introduction on computer programming" (Expand search)
"advanced python python computer programming" » "advanced python python computer program" (Expand search), "advanced python python computer programs" (Expand search), "advanced method python computer programming" (Expand search), "advanced path python computer programming" (Expand search), "advanced symphony python computer programming" (Expand search), "advanced pythons python computer programming" (Expand search), "advanced piton python computer programming" (Expand search), "advanced pitons python computer programming" (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 on computers programming") OR ("advanced python python computer programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"an introduction on computers programming\") OR (\"advanced python python computer programming\"))*".
• Removing quotes may allow a broader search: (( an introduction on computers programming ) OR ( advanced python python computer programming ))*.