Perhaps you should try some spelling variations:
2 politics » 2 political, 2 politische
3 politics » 3 political, 3 politische
2f sources » 2 sources, 21 sources, 20 sources
23 sources » 2.3 sources, 2 sources, 13 sources
3 sources » 2 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)) %((2 politics) OR (3 politics)) AND government %2f 18th century %((2f sources) OR (((23 sources) OR (3 sources))))%22.
• Adding a wildcard symbol may retrieve word variants: %((22new spain) or (new spain)) %((2 politics) or (3 politics)) and government %2f 18th century %((2f sources) or (((23 sources) or (3 sources))))%22*.