Perhaps you should try some spelling variations:
2f politics » 21 politics, 22 politics, 23 politics
20 politics » 10 politics, 21 politics, 20 political
2 politics » 3 politics, 2 political, 2 politische
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: %new spain %((((2f politics) OR (2 politics))) OR (20 politics)) AND government %2f 18th century %((2 sources) OR (21 sources))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%new spain %((((2f politics) OR (2 politics))) or (20 politics)) and government %2f 18th century %((2 sources) or (21 sources))%22".
• Adding a wildcard symbol may retrieve word variants: %new spain %((((2f politics) OR (2 politics))) or (20 politics)) and government %2f 18th century %((2 sources) or (21 sources))%22*.