Perhaps you should try some spelling variations:
"using attenuation using reference array" » "using attention using reference array" (Expand search), "rain attenuation using reference array" (Expand search), "in attenuation using reference array" (Expand search), "using attenuation in reference array" (Expand search), "using attenuation and reference array" (Expand search), "using attenuation using reference area" (Expand search), "using attenuation using reference areas" (Expand search), "using attenuation using reference cardiac" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using attenuation using reference array\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( using attenuation using reference array ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using attenuation using reference array") OR ("using coding python python programming"))*.