Perhaps you should try some spelling variations:
proton structure » protein structure (Expand search), prison structure (Expand search), proteins structure (Expand search)
function proton » function protein (Expand search), function motor (Expand search), function prior (Expand search)
coder function » modern function (Expand search), power function (Expand search), over function (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
using python » usando python (Expand search), in python (Expand search)
using using » using fusing (Expand search), housing using (Expand search), nursing using (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( coder function proton structure AND ) OR ( using using python python programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coder function proton structure and ) OR ( using using python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder function proton structure and ) OR ( using using python python programming ))*.