Perhaps you should try some spelling variations:
2f politics » 2 politics, 21 politics, 22 politics
20 politics » 2 politics, 10 politics, 20 political
2.1 sources » 2.2 sources, 5.2 sources, 3.2 sources
22 sources » 2.2 sources, 252 sources, 12 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) OR (new spain)) %((2f politics) OR (20 politics)) AND government %2f 18th century %((22 sources) OR (((2.1 sources) OR (2 sources))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22new spain) OR (new spain)) %((2f politics) or (20 politics)) and government %2f 18th century %((22 sources) or (((2.1 sources) or (2 sources))))%22".
• Adding a wildcard symbol may retrieve word variants: %((22new spain) OR (new spain)) %((2f politics) or (20 politics)) and government %2f 18th century %((22 sources) or (((2.1 sources) or (2 sources))))%22*.