Perhaps you should try some spelling variations:
21 resources » 2 resources, 1 resources, 11 resources
22new spain » new spain
20 politics » 2 politics, 10 politics, 20 political
21 sources » 2.1 sources, 21 source, 2.2 sources
11 sources » 13 sources, 2.1 sources, 3 sources
1 sources » 3 sources

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: %22new spain %20 politics AND government %2f 18th century %((2 sources) OR (((((((21 sources) OR (21 resources))) OR (1 sources))) OR (11 sources))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22new spain %20 politics and government %2f 18th century %((2 sources) or (((((((21 sources) OR (21 resources))) or (1 sources))) or (11 sources))))%22".
• Adding a wildcard symbol may retrieve word variants: %22new spain %20 politics and government %2f 18th century %((2 sources) or (((((((21 sources) OR (21 resources))) or (1 sources))) or (11 sources))))%22*.