
I suggest some of the following options to improve:
- remove series names that's never used in the website anymore. they can be misleading, making coins from same series having multiple series names in the catalog
- restrict candidates to the series names used under same issuer / country / currency
- improve the text relevance of search result, or restrict only to prefix match
- sort candidate results alphabetically and do not highlight best candidate, unless it's a complete match or the user hit ↑↓ button to navigate the candidate drop-down area