Perhaps you should try some spelling variations:
extraction method » extraction methods (Expand search)
basic extraction » based extraction (Expand search), classic extraction (Expand search), based extractions (Expand search)
power function » liver function (Expand search), taper function (Expand search)
function basic » functions basic (Expand search), function based (Expand search), functional basis (Expand search)
usando codigo » usando codigos (Expand search), jusante codigo (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( power function basic extraction method ) OR ( usando codigo python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( power function basic extraction method ) OR ( usando codigo python python programming ))*.