Perhaps you should try some spelling variations:
information agents » information age, information access, information about
using definition » sensing definition, aging definitions, timing definition
from liberia » from nigeria, from liver, from libya
from siberia » from nigeria, from sierra, from serial
from laser » from lake

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

• If you are trying to use Boolean operators, they must be ALL CAPS: information agents using definition ((((from liberia) OR (from laser))) OR (from siberia))~.
• Adding a wildcard symbol may retrieve word variants: information agents using definition ((((from liberia) or (from laser))) or (from siberia))*.