If there is an exact match then it brings that up first, if not then it just brings up similar phrases or suggestions.
To filter by scale you just hit Rail, then click the categories at the top, so OO Gauge, then hit rolling stock, then hit wagons. Then you're just browsing OO wagons. Then you can filter by brand and whether you want tmc weathered or pristine, era. etc etc.
Please see video attached. Let me know if this doesn't work for you!
Screen Recording 2024-02-19 at 12.05.26 (1).mp4
All the best
Alex