Perhaps you should try some spelling variations:
"and computational using computer program" » "and computation using computer program" (Expand search), "and computations using computer program" (Expand search), "and computacional usinas computer program" (Expand search), "_ computational using computer program" (Expand search)
"using models sum python programming" » "ising models sum python programming" (Expand search), "using model sum python programming" (Expand search), "nursing models sum python programming" (Expand search), "using models sdm python programming" (Expand search), "using models stem python programming" (Expand search), "using models sdms 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 computational using computer program\") OR (\"using models sum python programming\"))~".
• Removing quotes may allow a broader search: (( and computational using computer program ) OR ( using models sum python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("and computational using computer program") OR ("using models sum python programming"))*.