MS SQL Fulltext Search for Roman Numerals

Question

My query is "Rocky IV" but I also want rocky 4 to appear. I set up this on my thesaurus file, _{4 iv}

and use formsof thesaurus in my query. I am using CONTAINSTABLE.

But a seemingly random set of all titles that contain the word rocky come back. Rocky i, Rocky and Bullwinkle, etc. Actual Rocky IV and rocky 4 are somewhere in the middle if I sort by rank.

Is the number too short? How can I improve my search results to put rocky iv and rocky 4 at the top?

Answer 1

Turned off stopwords with ALTER FULLTEXT INDEX ON MyTable SET STOPLIST = OFF

Works fine now.
Relevant links: Tell me SQL Server Full-Text searcher is crazy, not me

Make SQL Server index small numbers