Perhaps you should try some spelling variations:
"using computing using sio2 array" » "using competing using sio2 array" (Expand search), "mining computing using sio2 array" (Expand search), "using conducting using sio2 array" (Expand search), "using computing ufcg sio2 array" (Expand search), "using computing using tio2 array" (Expand search), "using computing using six array" (Expand search)
"using in python python programming" » "using in pythons python programming" (Expand search), "using in piton python programming" (Expand search), "using in pitons python programming" (Expand search), "using _ 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: (("using computing using sio2 array") OR ("using in python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computing using sio2 array\") OR (\"using in python python programming\"))*".
• Removing quotes may allow a broader search: (( using computing using sio2 array ) OR ( using in python python programming ))*.