Perhaps you should try some spelling variations:
nano science » nato science, radio science, nanoscience _
20 physics » 10 physics, 2d physics, 2007 physics
stories b » stories _, stories a, stories 2
stories c » stories _, stories a, stories 2
2 physics » 2 physical

Try widening your search to All Fields.

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: %nano science ((stories b) OR (stories c))%3a%((20 physics) OR (2 physics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%nano science ((stories b) OR (stories c))%3a%((20 physics) or (2 physics))%22".
• Adding a wildcard symbol may retrieve word variants: %nano science ((stories b) OR (stories c))%3a%((20 physics) or (2 physics))%22*.