Perhaps you should try some spelling variations:
8.4 models » 2.4 models, 5.4 models, 1.4 models
24 modern » 4 modern, 8.4 modern, 24 model
14 modern » 4 modern, 8 modern, 14 model
8.4 model » 3.4 model, 6.4 model, 1.4 model

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: %22history%((((24 modern) OR (14 modern))) OR (((8.4 model) OR (8.4 models))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22history%((((24 modern) OR (14 modern))) or (((8.4 model) or (8.4 models))))%22".
• Adding a wildcard symbol may retrieve word variants: %22history%((((24 modern) OR (14 modern))) or (((8.4 model) or (8.4 models))))%22*.