Perhaps you should try some spelling variations:
transfer functions » transfer function (Expand search), pedotransfer functions (Expand search)
extraction method » extraction methods (Expand search)
based extraction » based interaction (Expand search), phase extraction (Expand search), and extraction (Expand search)
functions based » function based (Expand search), functions case (Expand search), functions used (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: (( transfer functions based extraction method ) OR ( using codigo python python programming ))~.