Perhaps you should try some spelling variations:
coder perfusion » modern perfusion (Expand search), under perfusion (Expand search), liver perfusion (Expand search)
using rotating » in rotating (Expand search)
perfusion an » perfusion and (Expand search), perfusion in (Expand search), perfusion on (Expand search)
an objective » and objective (Expand search), of objective (Expand search), bi objective (Expand search)
rotating in » rotating ring (Expand search), rotating twin (Expand search), rotating spin (Expand search)
in python » _ python (Expand search)

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

• Removing quotes may allow a broader search: (( coder perfusion an objective programming ) OR ( using rotating in python programming ))~.