Perhaps you should try some spelling variations:
"api pitons python python programming" » "api pitons pythons python programming" (Expand search), "api pitons piton python programming" (Expand search), "api pitons pytm python programming" (Expand search), "api citons python python programming" (Expand search), "api pitoni python python programming" (Expand search), "api pitoes python python programming" (Expand search)
"coder coding and sparse coding" » "modern coding and sparse coding" (Expand search), "color coding and sparse coding" (Expand search), "odor coding and sparse coding" (Expand search), "coder coding rna sparse coding" (Expand search), "coder coding and space coding" (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 coding and sparse coding\") OR (\"api pitons python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coding and sparse coding ) OR ( api pitons python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coding and sparse coding") OR ("api pitons python python programming"))*.