Perhaps you should try some spelling variations:
8.4 modern » 8.4 model, 24 modern, 8.4 mode
8.4 models » 2.4 models, 5.4 models, 1.4 models
14 modern » 7 modern, 14 model, 14 models
24 model » 2.4 model, 4 model, 14 model
8 modern » 8 model, 8 models

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 model) OR (((14 modern) OR (8 modern))))) OR (((8.4 modern) OR (8.4 models))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22history%((((24 model) or (((14 modern) OR (8 modern))))) or (((8.4 modern) or (8.4 models))))%22".
• Adding a wildcard symbol may retrieve word variants: %22history%((((24 model) or (((14 modern) OR (8 modern))))) or (((8.4 modern) or (8.4 models))))%22*.