Perhaps you should try some spelling variations:
"using computational using sio2 array" » "and computational using sio2 array" (Expand search), "using computation using sio2 array" (Expand search), "using computations using sio2 array" (Expand search), "using computacional usinas sio2 array" (Expand search), "using computational using tio2 array" (Expand search), "using computational using six array" (Expand search)
"using rotating python python programming" » "in rotating python python programming" (Expand search), "using rotating pythons python programming" (Expand search), "using rotating piton python programming" (Expand search), "using rotating pitons 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: "((\"using computational using sio2 array\") OR (\"using rotating python python programming\"))~".
• Removing quotes may allow a broader search: (( using computational using sio2 array ) OR ( using rotating python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational using sio2 array") OR ("using rotating python python programming"))*.