Perhaps you should try some spelling variations:
extraction method » extraction methods (Expand search)
coder relations » border relations (Expand search), power relations (Expand search), over relations (Expand search)
an extraction » on extraction (Expand search), in extraction (Expand search), non extraction (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
relations an » relations and (Expand search), relations among (Expand search)
using python » usando python (Expand search), in python (Expand search)
using using » housing using (Expand search), aging using (Expand search), ring using (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: "(( coder relations an extraction method ) OR ( using using python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder relations an extraction method ) OR ( using using python python programming ))*.