Perhaps you should try some spelling variations:
protection method » protection methods (Expand search), projection method (Expand search), projection methods (Expand search)
used protection » user protection (Expand search), uses protection (Expand search), based protection (Expand search)
four functions » floor functions (Expand search), fourier functions (Expand search), flour functional (Expand search)
functions used » functions based (Expand search), functions using (Expand search), functions under (Expand search)
coding python » codigo python (Expand search), codigos python (Expand search), using python (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
using coding » using coping (Expand search), using coating (Expand search), using cooking (Expand search)

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

• Removing quotes may allow a broader search: (( four functions used protection method ) OR ( using coding python python programming ))~.