Perhaps you should try some spelling variations:
10 political » 10 practical
22new spain » new spain
20 politics » 2 politics, 10 politics, 5 politics
2f sources » f sources, 20 sources, 22 sources
21 sources » 2.1 sources, 1 sources, 11 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) OR (((20 political) OR (10 political)))) AND government %2f 18th century %((2f sources) OR (((21 sources) OR (2 sources))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22new spain %((20 politics) or (((20 political) OR (10 political)))) and government %2f 18th century %((2f sources) or (((21 sources) or (2 sources))))%22".
• Adding a wildcard symbol may retrieve word variants: %22new spain %((20 politics) or (((20 political) OR (10 political)))) and government %2f 18th century %((2f sources) or (((21 sources) or (2 sources))))%22*.