Perhaps you should try some spelling variations:
"developer perceptions using sio2 program" » "developers perceptions using sio2 program" (Expand search), "development perception using sio2 program" (Expand search), "developer relations using sio2 program" (Expand search), "developer perception using sio2 program" (Expand search), "developer perceptions during sio2 program" (Expand search), "developer perceptions buying sio2 program" (Expand search), "developer perceptions using 2 program" (Expand search), "developer perceptions using 2012 program" (Expand search), "developer perceptions using 2002 program" (Expand search), "developer perceptions using tio2 program" (Expand search), "developer perceptions using six program" (Expand search)
"using python python python programming" » "using pythons python python programming" (Expand search), "using piton python python programming" (Expand search), "using pitons python python programming" (Expand search), "usando python python python programming" (Expand search), "in python 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: "((\"developer perceptions using sio2 program\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( developer perceptions using sio2 program ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("developer perceptions using sio2 program") OR ("using python python python programming"))*.