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
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 %((21 bibliography) OR (23 bibliography)) %2f catalogs%22.
• Adding a wildcard symbol may retrieve word variants: %22political science %((21 bibliography) or (23 bibliography)) %2f catalogs%22*.