Perhaps you should try some spelling variations:
opinion extraction » solution extraction (Expand search), lignin extraction (Expand search), non extraction (Expand search)
java programming » and programming (Expand search), based programming (Expand search), goal programming (Expand search)
extraction java » extraction data (Expand search), extraction and (Expand search), extraction case (Expand search)
cutting python » cutting path (Expand search), using python (Expand search), cutting method (Expand search)
coder opinion » voter opinion (Expand search), model opinion (Expand search), concern opinion (Expand search)
using cutting » using rotating (Expand search), using resting (Expand search), using clustering (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.

• Removing quotes may allow a broader search: (( coder opinion extraction java programming ) OR ( using cutting python python programming ))~.