Perhaps you should try some spelling variations:
military actions » military relations, military aviation, military pensions
military acts » military art, military aspects, military action
19th century » 20th century
2f history » imf history, etf history, ref history

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: %((military acts) OR (military actions)) AND science %2f history %2.1 ((19th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((military acts) OR (military actions)) and science %2f history %2.1 ((19th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %((military acts) OR (military actions)) and science %2f history %2.1 ((19th century) or (18th century))%22*.