Perhaps you should try some spelling variations:
22political science » political science, inpolitical science, political sciences
21 bibliography » 11 bibliography, 1 bibliography, 22 bibliography
23 bibliography » 3 bibliography, 13 bibliography, 22 bibliography
mef catalogs » e catalogs, icf catalogs, gems catalogs
2f catalogs » icf catalogs, 2.4 catalogs, _ catalogs

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: %22political science %((21 bibliography) OR (23 bibliography)) %((2f catalogs) OR (mef catalogs))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22political science %((21 bibliography) or (23 bibliography)) %((2f catalogs) OR (mef catalogs))%22".
• Adding a wildcard symbol may retrieve word variants: %22political science %((21 bibliography) or (23 bibliography)) %((2f catalogs) OR (mef catalogs))%22*.