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)
"wave function _ coding program" » "wave function _ cloning program" (Expand search), "wave function _ loading program" (Expand search), "wave function _ cooling programs" (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: (("wave function _ coding program") OR ("an introduction python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"wave function _ coding program\") OR (\"an introduction python python programming\"))".
• Removing quotes may allow a broader search: (( wave function _ coding program ) OR ( an introduction python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("wave function _ coding program") OR ("an introduction python python programming"))*.