A family of Microsoft relational database management systems designed for ease of use.
First, its not a good idea to piggyback your question on another thread. Its usually best to start your own question, maybe with a link to the original thread.
That being said, the way to do this is with a keywords table:
tblKeyword
KeywordID (PK Autonumber)
RecordID (FK)
Keyword
You would enter keywords (or phrases) using a subform linked to the main form. You can then create a query that joins your main table on RecordID. From there you can do a search on the Keyword field for any matches and returns the matching records.