Perhaps you should try some spelling variations:
"an introduction to compare programmingrs" » "an introduction to core 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"an introduction to compare programmingrs\") OR (\"advanced python python computer programming\"))~".
• Removing quotes may allow a broader search: (( an introduction to compare programmingrs ) OR ( advanced python python computer programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("an introduction to compare programmingrs") OR ("advanced python python computer programming"))*.