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