Perhaps you should try some spelling variations:
20 political » 10 political
2f politics » 2 politics, 20 politics, 21 politics
22 sources » 2.2 sources, 252 sources, 12 sources
21 sources » 2.1 sources, 11 sources, 21 source
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: %new spain %((2f politics) OR (20 political)) AND government %2f 18th century %((22 sources) OR (((((21 sources) OR (1 sources))) OR (2 sources))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%new spain %((2f politics) or (20 political)) and government %2f 18th century %((22 sources) or (((((21 sources) OR (1 sources))) or (2 sources))))%22".
• Adding a wildcard symbol may retrieve word variants: %new spain %((2f politics) or (20 political)) and government %2f 18th century %((22 sources) or (((((21 sources) OR (1 sources))) or (2 sources))))%22*.