Perhaps you should try some spelling variations:
protection method » protection methods (Expand search), projection method (Expand search), projection methods (Expand search)
based protection » based production (Expand search), basic protection (Expand search), shared protection (Expand search)
functions based » function based (Expand search), functions case (Expand search), functions used (Expand search)
four functions » floor functions (Expand search), fourier functions (Expand search), flour functional (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
using codigo » using indigo (Expand search), using coding (Expand search), using codium (Expand search)

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

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