Perhaps you should try some spelling variations:
"an introduction python python programming" » "an introduction section python programming" (Expand search), "an introduction earthen python programming" (Expand search), "an introduction methods python programming" (Expand search), "an introduction pythons python programming" (Expand search), "an introduction piton python programming" (Expand search), "an introduction pitons python programming" (Expand search)
"coder solution and screening program" » "code solution and screening program" (Expand search), "powder solution and screening program" (Expand search), "copper solution and screening program" (Expand search), "coder solution cancer screening program" (Expand search), "coder evolution and screening program" (Expand search), "coder solution _ screening program" (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: "((\"coder solution and screening program\") OR (\"an introduction python python programming\"))~".
• Removing quotes may allow a broader search: (( coder solution and screening program ) OR ( an introduction python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder solution and screening program") OR ("an introduction python python programming"))*.