Perhaps you should try some spelling variations:
3 politische » 3 political
3 politics » 3 political
2f sources » 2 sources, f sources, 20 sources
21 sources » 2.1 sources, 2 sources, 11 sources
1 sources » 2 sources, 3 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) OR (new spain)) %((3 politics) OR (3 politische)) AND government %2f 18th century %((2f sources) OR (((21 sources) OR (1 sources))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22new spain) or (new spain)) %((3 politics) OR (3 politische)) and government %2f 18th century %((2f sources) or (((21 sources) or (1 sources))))%22".
• Adding a wildcard symbol may retrieve word variants: %((22new spain) or (new spain)) %((3 politics) OR (3 politische)) and government %2f 18th century %((2f sources) or (((21 sources) or (1 sources))))%22*.