Perhaps you should try some spelling variations:
"and computation using covariant program" » "and computations using covariant program" (Expand search), "and computation in covariant program" (Expand search), "and composition using covariant program" (Expand search), "and computational using covariant program" (Expand search), "of computation using covariant program" (Expand search), "and computation using invariant program" (Expand search), "and computation using invariants program" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking python python 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: "((\"and computation using covariant program\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( and computation using covariant program ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("and computation using covariant program") OR ("using coding python python programming"))*.