Perhaps you should try some spelling variations:
military actions » military relations, military aviation, military pensions
military acts » military art, military aspects, military action
2f history » imf history, etf history, ref history
2019 19th » 2019 16th, 2019 4th, 2019 6th
2.1 19th » 2018 19th, 2012 19th, 2016 19th

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: %((military acts) OR (military actions)) AND science %2f history %((2.1 19th) OR (2019 19th)) 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) or (2019 19th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((military acts) OR (military actions)) and science %2f history %((2.1 19th) or (2019 19th)) century%22*.