Perhaps you should try some spelling variations:
22political science » political science, inpolitical science, politcal science
political sciences » political science, clinical sciences, political scientists
2f bibliography » 22 bibliography, 21 bibliography, 24 bibliography
23 bibliography » 3 bibliography, 13 bibliography, 22 bibliography
2f catalogs » icf catalogs, 2.4 catalogs, mef 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) OR (political sciences)) %((2f bibliography) OR (23 bibliography)) %2f catalogs%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22political science) OR (political sciences)) %((2f bibliography) or (23 bibliography)) %2f catalogs%22".
• Adding a wildcard symbol may retrieve word variants: %((22political science) OR (political sciences)) %((2f bibliography) or (23 bibliography)) %2f catalogs%22*.