Perhaps you should try some spelling variations:
"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)
"advanced oxidation in computer program" » "advanced oxidation and computer program" (Expand search), "advanced oxidation of computer program" (Expand search), "advanced oxidation _ computer program" (Expand search), "advances oxidation in computer program" (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: "((\"advanced oxidation in computer program\") OR (\"using codigo python python programming\"))~".
• Removing quotes may allow a broader search: (( advanced oxidation in computer program ) OR ( using codigo python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("advanced oxidation in computer program") OR ("using codigo python python programming"))*.