Perhaps you should try some spelling variations:
"using computational of sio2 array" » "and computational of sio2 array" (Expand search), "using computational one sio2 array" (Expand search), "using computational _ sio2 array" (Expand search), "using computational 3d sio2 array" (Expand search)
"using codigo python python programming" » "using codigo pythons python programming" (Expand search), "using codigo piton python programming" (Expand search), "using codigo pitons python programming" (Expand search), "using indigo python python programming" (Expand search), "using coding python python programming" (Expand search), "using codium python 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 of sio2 array\") OR (\"using codigo python python programming\"))~".
• Removing quotes may allow a broader search: (( using computational of sio2 array ) OR ( using codigo python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational of sio2 array") OR ("using codigo python python programming"))*.