Perhaps you should try some spelling variations:
transfer function » pedotransfer functions (Expand search)
extraction method » extraction methods (Expand search)
basic extraction » based extraction (Expand search), classic extraction (Expand search), based extractions (Expand search)
function basic » functions basic (Expand search), function based (Expand search), functional basis (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: (( transfer function basic extraction method ) OR ( using coding python python programming ))~.