Perhaps you should try some spelling variations:
"and computation using computer program" » "and computations using computer program" (Expand search), "and computation in computer program" (Expand search), "and composition using computer program" (Expand search), "and computational using computer program" (Expand search), "of computation using computer program" (Expand search)
"using mobile and python programming" » "using mobile app python programming" (Expand search), "using mobile in python programming" (Expand search), "using mobile on python programming" (Expand search), "using mobile api python programming" (Expand search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("and computation using computer program") OR ("using mobile and python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computation using computer program\") OR (\"using mobile and python programming\"))".
• Removing quotes may allow a broader search: (( and computation using computer program ) OR ( using mobile and python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and computation using computer program") OR ("using mobile and python programming"))*.