Perhaps you should try some spelling variations:
24 modern » 14 modern, 8.4 modern
6.4 model » 3.4 model
2.4 model » 2.4 models, 3.4 model, 1.4 model
24 model » 14 model, 3.4 model, 1.4 model
o4 model » 14 model, 14 models, 3.4 model
4 modern » 4 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 modern) OR (((((((24 model) OR (6.4 model))) OR (o4 model))) OR (2.4 model))))) OR (4 modern))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22history%((((24 modern) or (((((((24 model) OR (6.4 model))) or (o4 model))) or (2.4 model))))) or (4 modern))%22".
• Adding a wildcard symbol may retrieve word variants: %22history%((((24 modern) or (((((((24 model) OR (6.4 model))) or (o4 model))) or (2.4 model))))) or (4 modern))%22*.