Perhaps you should try some spelling variations:
"an introduction to computers programming" » "an introduction to computer programming" (Expand search), "an introduction to computer programs" (Expand search), "an introduction to compute programming" (Expand search), "an introduction of computers programming" (Expand search), "an introduction to computers programaming" (Expand search)
"advanced python python computer program" » "advanced method python computer program" (Expand search), "advanced path python computer program" (Expand search), "advanced symphony python computer program" (Expand search), "advanced pythons python computer program" (Expand search), "advanced piton python computer program" (Expand search), "advanced pitons python computer program" (Expand search), "advanced python python computer programa" (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 computers programming\") OR (\"advanced python python computer program\"))~".
• Removing quotes may allow a broader search: (( an introduction to computers programming ) OR ( advanced python python computer program ))~.
• Adding a wildcard symbol may retrieve word variants: (("an introduction to computers programming") OR ("advanced python python computer program"))*.