Perhaps you should try some spelling variations:
"advanced computation in refraction errors" » "advanced computations in refraction errors" (Expand search), "advanced computational in refraction errors" (Expand search), "advance computational in refraction errors" (Expand search), "advanced computation in refractive errors" (Expand search), "advanced computation in refractive error" (Expand search), "advanced computation in refractive erros" (Expand search), "advanced computation and refraction errors" (Expand search), "advanced computation of refraction errors" (Expand search), "advanced imputation in refraction errors" (Expand search), "advanced computation sign refraction errors" (Expand search), "advanced computation in reaction errors" (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("advanced computation in refraction errors") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"advanced computation in refraction errors\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( advanced computation in refraction errors ) OR ( using coding python python programming ))*.