The ANS search tools are all keyword based. This means that you can type in a word and, unless instructed otherwise, the database will look for it in any field. The database will look for records that match all criteria.
Searches are case-insensitive.
Most one and two character words are not indexed so that your search will fail if they are included. However, Roman numerals are indexed so that searching for 'Constantine II' in the Person field will find coins of that emperor. Numeric fields and numeric words within text fields are not usually indexed. See the instructions for each database for details. There is a limit of 5000 records returned per search.