Perhaps you should try some spelling variations:
22new spain » new spain
2f politics » 2 politics, 20 politics, 21 politics
2f sources » 2 sources, f sources, 20 sources
21 sources » 2.1 sources, 2 sources, 1 sources

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