Perhaps you should try some spelling variations:
"lean implementation and computer program" » "an implementation and computer program" (Expand search), "and implementation and computer program" (Expand search), "design implementation and computer program" (Expand search), "lean implementation of computer program" (Expand search), "lean implementation _ computer program" (Expand search)
"using codigo python python programming" » "using codigo pythons python programming" (Expand search), "using codigo piton python programming" (Expand search), "using codigo pitons python programming" (Expand search), "using indigo python python programming" (Expand search), "using coding python python programming" (Expand search), "using codium python python programming" (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: (("lean implementation and computer program") OR ("using codigo python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"lean implementation and computer program\") OR (\"using codigo python python programming\"))".
• Removing quotes may allow a broader search: (( lean implementation and computer program ) OR ( using codigo python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("lean implementation and computer program") OR ("using codigo python python programming"))*.